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Pairs of enantiomers have the same chemical and physical properties (except rotation of plane polarized light) within an achiral environment. However, I am curious about the thermodynamic properties of pairs of enantiomers: say a molecule has a certain $\Delta H_f$, $\Delta S$, and $\Delta G_f$; will its enantiomer hav... |
[![enter image description here][1]][1] [![enter image description here][2]][2]
[1]: https://i.stack.imgur.com/ZZB1Q.png
[2]: https://i.stack.imgur.com/Sw5sI.png
---
I initially approached it like this:
As both are allylic carbocations, and that both are in fact resonating structures of the same... |
### Problem
> [![3‐iodoprop‐1‐ene + HI + CCl4][1]][1]
### Answer > [![1,2‐diiodopropane][2]][2]
I thought "I" can stabilizes carbocation formed intially by resonance so there can be a shift of (+) to the carbon close to "I" and hence forming the product 1,1-diiodopropane but given is 1,2 ... |
According to Markovnikov rule and stability of carbocation which is most likely to form if HI "excess" is not given? |
**Context**: I was casually looking through some old questions when I found [this question][1]. This questions generally wants a compound that has all the hydrates ranging from monohydrate to decahydrate. I searched Wikipedia where I found [chromium(III) sulfate][2], $\ce{Cr2(SO4)3.x(H2O)}$ where x=0-18. But, the formu... |
What is the maximum number of water molecules that has been recorded till date to present as water of crystallization in a compound? |
>Which of the following structures would be least stable?
>
>[![enter image description here][1]][1] [![enter image description here][2]][2]
[1]: https://i.stack.imgur.com/ZZB1Q.png
[2]: https://i.stack.imgur.com/Sw5sI.png
---
I initially approached it like this:
As both are allylic carbocatio... |
My teacher gave me the following question:
> What are the possible products of these reactions? Then, what is the mechanism of those reaction (elimination (E1 or E2) or subtitution (S<sub>N</sub>1 or S<sub>N</sub>2)? Explain in as much detail as possible.
>
>$$\ce {CH3Cl + OH- ->} ?$$
>
>$$\ce {(CH3)3CCl + OH- ... |
My book says, "*halide anions are electronegative and can easily **stabilise
negative charge**, hence are good leaving groups.*"
What exactly does "*stabilising negative charge*" mean?
I have read: "It is crucial that the leaving group be able to stabilize the additional electron density that results from bond... |
DCC is a well known reagent used for the synthesis of peptides, aiding the formation of the amide bond by forming an intermediate with the carboxylic acid that contains a leaving group. During my research on the reagent HOBt, or hydroxybenzotriazole, I came across a scheme which showed DCC and HOBt being used in conjun... |
>The decreasing order of acid strength of the following compounds:
>
>The given compounds are
Water ($\ce{H2O}$)
Ammonia ($\ce{NH3}$)
Acetylene ($\ce{C2H2}$)
Triphenyl system ($\ce{Ph3CH}$)
>
>a) $\ce{NH3}$ > $\ce{Ph3CH}$ > $\ce{C2H2}$ > $\ce{H2O}$
b) $\ce{H2O}$ > $\ce{C2H2}$ > $\ce{Ph3CH}$ > $\c... |
Here, this was a simple question of checking the most acidic compound out of the four and this would have given you the answer. $\ce{H2O}$ will be most acidic as the negative charge will be formed on an oxygen compared to nitrogen and carbon in the other two cases.
However, the interesting question here is the part ... |
This question came through answering a [question that talked about the acidic order of four compounds](https://chemistry.stackexchange.com/questions/149830/finding-order-of-acidic-strength-for-given-compounds?noredirect=1#comment303482_149830).
Upon researching the actual $\mathrm p K_\mathrm a$ values I noticed th... |
Here, this was a simple question of checking the most acidic compound out of the four and this would have given you the answer. $\ce{H2O}$ will be most acidic as the negative charge will be formed on an oxygen compared to nitrogen and carbon in the other two cases.
However, the interesting question here is the part ... |
HCl is a molecular compound because
there is an covalent bond between H+ (a hydrogen ion) and Cl- (a chloride ion)
NH4NO3 is an ionic compound because
there is an ionic bond between NH4+ (an ammonium ion) and NO3-(a nitrate ion)
even though all the atoms comprising the molecule are non-metal.
Then, which of t... |
In the synthesis of Panacene by Canesi *et al.* [[1][1]], a step involves the installation of an -OH group on a double bond, using the oxymercuration-demercuration procedure. However, the product happens to be a hemiacetal, as shown in the picture. With a 78% yield, it seems that the hemiacetal is not reactive towards ... |
I am preparing notes on buffers and I came across this problem on a website:
> Given 10.0 mmol of a weak acid HA with $\textrm{p}K_a =5$, how many mmol of NaA needs to be added to have a final $\textrm{p}H = 5$?
The solution method shown used the Henderson-Hasselbalch equation
$$\textrm{p}H = \textrm{p}K_a + \... |
>$\ce{HCl}$ is a molecular compound because there is a covalent bond between $\ce{H+}$(a proton) and $\ce{Cl-}$ (a chloride ion)
>
>$\ce{NH4NO3}$ is an ionic compound because there is an ionic bond between $\ce{NH4+}$ (an ammonium ion) and $\ce{NO3-}$ (a nitrate ion) even though all the atoms comprising the molecule ... |
Reaction: CH3-CH_= CH-CH3 + HI (excess) Product : i thought of different carbons by the reasoning from this post earlier i posted https://chemistry.stackexchange.com/q/149820/106350 . But given is both iodines in same carbon is this an exception or answer given is incorrect? Note: _= refers to triple bond |
Will product be having two iodine in same carbon or different ? (HI addition to alkynes) |
Reaction: $\ce{CH3-C#C-CH3 + HI (excess) -> ?}$
Product : I thought of different carbons by the reasoning from [this post earlier I posted](https://chemistry.stackexchange.com/q/149820/106350). But it is given that both iodine atoms exist on the same carbon.
Is this an exception or is the answer given incorrect? |
Does a geminal or vicinal diiodide form upon addition of excess HI to but-2-yne? |
Here, this was a simple question of checking the most acidic compound out of the four and this would have given you the answer. $\ce{H2O}$ will be most acidic as the negative charge will be formed on an oxygen compared to nitrogen and carbon in the other two cases.
However, the interesting question here is the part ... |
Where can you find the enthalpy and Gibbs free energy of formation and entropy of compounds either as a data file or web API? Technically, I only need two since I can figure out the other one from two of them. |
Where to find data for Gibbs energy, enthalpy, and entropy? |
Sodium borohydride ($NaBH_4$) is a reducing agent used in various organic reaction to reduce aldehydes, ketones and acyl chlorides.
Why can't sodium borohydride reduce carboxylic acid groups and esters? Why can it reduce acyl chlorides but not esters, both which are derivatives of the carboxylic acid group?
I rea... |
Why can't sodium borohydride reduce carboxylic acid and ester groups? |
Is it necessary for all compounds to have a triple point? Also, how is the triple point determined?
Suppose a substance does not have a triple point, so how do researchers agree on the impossibility of existence of a triple point in such a case? Also, can there be multiple triple points for a compound?
Also, sin... |
I was studying about alkali metals. I can get how oxides and peroxides are formed.
In alkali metal oxides, both of the bonds of the dioxygen molecule first undergoes homolytic cleavage, then the nascent oxygen gets two electrons from two metal atoms.
In alkali metal peroxides, one bond of dioxygen molecule unde... |
What is the mechanism of formation of alkali metal superoxide? |
Here, this was a simple question of checking the most acidic compound out of the four and this would have given you the answer. $\ce{H2O}$ will be most acidic as the negative charge will be formed on an oxygen compared to nitrogen and carbon in the other two cases.
However, the interesting question here is the part ... |
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/0HRwG.jpg
I have found the rate constant and found that the orders of ethyl iodide and pyridine are both 1 with respect to the reaction when their initial concentrations were both 0.1 M. I would have thought this would be the case for an... |
Are the orders of reactants with respect to a reaction different for different starting concentrations? |
Could anyone help me out solving this question regarding redox reactions? I am fairly new to this topic.
**Which of the following is a redox reaction?**
**(1)** $NaCl + KNO_{3} ------> NaNO_{3} + KCl$
**(2)** $CaCO_{3} ------> CaO + CO_{2}$
**(3)** $Mg(OH)_{2} + 2NH_{4}Cl -------> MgCl_{2} + 2NH_{4}OH
**... |
Could anyone help me solve this question regarding Redox reactions? |
Could anyone help me out solving this question regarding redox reactions? I am fairly new to this topic.
>Which of the following is a redox reaction?
(1) $\ce{NaCl + KNO3 -> NaNO3 + KCl}$
(2) $\ce{CaCO3 -> CaO + CO2}$
(3) $\ce{Mg(OH)2 + 2NH4Cl -> MgCl2 + 2NH4OH}$
(4) $\ce{Zn + 2AgCN -> 2Ag + Zn(CN)2}$
... |
**DISCLAIMER**
**DO NOT TRY TO DEMERCURATE USING DESCRIBED PROCEDURE. CONSULT YOUR EMERGENCY SERVICE.**
----------
I found a discrepancy between a [government-approved][1] [procedure][2] of living quarters demercuration and the [patent][3] RU 2081198 C1 the procedure is based on.
The last phase of clean... |
A reaction's rate does depend upon the consumption of its reactants, and the manner in which the reactants interact. Let's consider the following reaction: $$\ce{A + B -> final products}$$ The rate of consumption of reactants $$\dfrac{-d[A]}{dt}= k[A][B]$$ and $$\dfrac{-d[B]}{dt}= k[A][B]$$
It seems that this reac... |
**Context**: I was casually looking through some old questions when I found [this question][1]. The OP wanted a compound that has all the hydrates ranging from monohydrate to decahydrate. I found [chromium(III) sulfate][2] [$\ce{Cr2(SO4)3.x(H2O)}$ where x=0-18] to be suitable. But, the actual formula of the compound is... |
For the hydrolysis of $trans-\ce{[Co(en)2Cl2]Cl}$ (and *cis*) we measured reaction rates via spectrophotometry. Plots of change in absorbance $(\ln(A-A_\infty))$ were used to determine the rate law and the rate for the reaction. Using my data, I created the first-order plot seen below:
![enter image description here... |
A reaction's rate does depend upon the consumption of its reactants, and the manner in which the reactants interact. Let's consider the following reaction: $$\ce{A + B -> final products}$$ The rate of consumption of reactants $$\dfrac{-d[A]}{dt}= k[A][B]$$ and $$\dfrac{-d[B]}{dt}= k[A][B]$$
It seems that this reac... |
**DISCLAIMER**
**DO NOT TRY TO DEMERCURATE USING DESCRIBED PROCEDURE. CONSULT YOUR EMERGENCY SERVICE.**
----------
I found a discrepancy between a [government-approved][1] [procedure][2] of living quarters demercuration and the [patent][3] RU 2081198 C1 the procedure is based on.
The last phase of clean... |
Greg is quite correct: no clear question. But sometimes you don't know enough to define a question clearly. The implicit question is: "Is this mechanism helpful or even correct?" The second, clear, question, is why does rusting take time to happen.
I think the answer to the first, implicit, question is that it is a ... |
I think that answer would be:
1. Toluene and cyclohexane do not dissolve in water (since they are nonpolar), so I would first separate the water from the mixture with a separator funnel.
2. A mixture of cyclohexane and toluene would be separated by fractional distillation. Cyclohexane, which has a lower boiling... |
Which process would separate the mixture of toluene, cyclohexane and water? |
>Which of the following structures would be least stable?
>
>[![enter image description here][1]][1] [![enter image description here][2]][2]
[1]: https://i.stack.imgur.com/ZZB1Q.png
[2]: https://i.stack.imgur.com/Sw5sI.png
---
I initially approached it like this:
As both are allylic carbocatio... |
Formulas:
toluene: C6H5-CH3
cyclohexane: C6H12
I think that answer would be:
1. Toluene and cyclohexane do not dissolve in water (since they are nonpolar), so I would first separate the water from the mixture with a separator funnel.
2. A mixture of cyclohexane and toluene would be separated by fractional ... |
>Can the guanidinium ion react with inorganic nitrite under mild metalworking conditions ($\mathrm{pH\ 8 - 10}$ and temperature $\lt \pu{70^\circ C}$) to give stable *N*-nitrosamines?
Guanidinium ion is a mesomerism-stabilized system, and the nitroso group could be also stabilized by mesomerism therefore. But usuall... |
Can the guanidinium ion give stable N-nitrosamines under mild metalworking conditions? |
**DISCLAIMER**
**DO NOT TRY TO DEMERCURATE USING DESCRIBED PROCEDURE. CONSULT YOUR EMERGENCY SERVICE.**
----------
I found a discrepancy between a [government-approved][1] [procedure][2] of living quarters demercuration and the [patent][3] RU 2081198 C1 the procedure is based on.
The last phase of clean... |
>Can the guanidinium ion react with inorganic nitrite under mild basic metalworking conditions ($\mathrm{pH\ 8 - 10}$ and temperature $\lt \pu{70^\circ C}$) to give stable *N*-nitrosamines?
Guanidinium ion is a mesomerism-stabilized system, and the nitroso group could be also stabilized by mesomerism therefore. But ... |
Where can I find information on the chemical properties of $\ce{Cu2[HgI4]}$? I found a mention that in reaction with $\ce{Na2S2O3}$ in presence of acid it gives $\ce{HgS}$. |
How does the blue color of starch solution change depending on temperature and what is the cause for this? |
How to use Sodium Thiosulfate for fixing dicopper (I) tetraiodomercurate (II)? |
>Can the guanidinium ion react with inorganic nitrite under mild basic metalworking conditions ($\mathrm{pH\ 8 - 10}$ and temperature $\lt \pu{70^\circ C}$) to give stable *N*-nitrosamines?
Usually, the carcinogenic nitrosamines are generated from secondary amines. But guanidinium ion is not a secondary amine. Guani... |
This is a continuation from my [previous post][1].
Where can I find information on the chemical properties of $\ce{Cu2[HgI4]}$? I found a mention that in reaction with $\ce{Na2S2O3}$ in presence of acid it gives $\ce{HgS}$.
[1]: https://chemistry.stackexchange.com/questions/149787/how-to-use-sodium-thiosul... |
This is a continuation from my [previous post][1].
Could you please give me some info on the toxicity of compounds $\ce{HgI2}$ and $\ce{Cu2[HgI4]}$? I found on sigmaaldrich.com that these are very dangerous but could not find any information on the dosages for skin contact and swallowing.
[1]: https://chemist... |
**DISCLAIMER**
**DO NOT TRY TO DEMERCURATE USING DESCRIBED PROCEDURE. CONSULT YOUR EMERGENCY SERVICE.**
----------
I found a discrepancy between a [government-approved][1] [procedure][2] of living quarters demercuration and the [patent][3] RU 2081198 C1 the procedure is based on.
The last phase of clean... |
**DISCLAIMER**
**DO NOT TRY TO DEMERCURATE USING DESCRIBED PROCEDURE. CONSULT YOUR EMERGENCY SERVICE.**
----------
I found a discrepancy between a [government-approved][1] [procedure][2] of living quarters demercuration and the [patent][3] RU 2081198 C1 the procedure is based on.
The last phase of clean... |
Why are enthalpy of combustion and molar mass of organic compounds proportional? |
I was studying oxidising flames and realized that sodium burns with a bright yellow flame the wavelength of which is around 588 nm. Then I searched for emission spectra of sodium and found that the lines around 588 nm are the most intense ones, so it appears yellow. The same happened with potassium.
But wh... |
Why does hydrogen burn with a pale blue flame while its emission spectral lines are red in colour? |
I am making a custom grease (castor oil & sodium stearate) that will be suspended in beeswax. I have found that saponifying some beeswax for use in the grease results in higher operating temperatures after the grease is melted with the wax. I cannot have any glycerin in the final product, so I do not yet know how to pr... |
Does saponification of beeswax yield glycerin? |
I am making a custom grease (castor oil & sodium stearate) that will be suspended in beeswax. I have found that saponifying some beeswax for use in the grease results in higher operating temperatures after the grease is melted with the wax. I cannot have any glycerin in the final product, so I do not yet know how to pr... |
toluene: $\ce{C6H5-CH3}$
cyclohexane: $\ce{C6H12}$
---------------------
I think that answer would be:
1. Toluene and cyclohexane do not dissolve in water (since they are nonpolar), so I would first separate the water from the mixture with a separator funnel.
2. A mixture of cyclohexane and toluene wou... |
Sodium borohydride ($\ce{NaBH_4}$) is a reducing agent used in various organic reaction to reduce aldehydes, ketones and acyl chlorides.
Why can't sodium borohydride reduce carboxylic acid groups and esters? Why can it reduce acyl chlorides but not esters, both which are derivatives of the carboxylic acid group?
... |
> A mixture of helium and neon gases is collected over water at $28.0 \rm~^\circ C$ and $745\rm~ mmHg$. If the partial pressure of helium is $368\rm~ mmHg$, what is the partial pressure of neon? (Vapor pressure of water at $28\rm~^\circ C =28.3~mmHg$). Calculate the weight percentage of He and Ne in the original mixtur... |
> Which of these carboxylic acids can undergo decarboxylation readily?
>
> [![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/8ue7n.jpg
According to what I know beta-keto acids undergo decarboxylation easily and readily due to formation of a stable intermediate. So my general answer was... |
**Context**: I was casually looking through some old questions when I found [this question][1]. The OP wanted a compound that has all the hydrates ranging from monohydrate to decahydrate. I found [chromium(III) sulfate][2] [$\ce{Cr2(SO4)3.x(H2O)}$ where x=0-18] to be suitable. But, the actual formula of the compound is... |
I am new to GC-FID and I am struggling with calibration curve. And I am strugling with the repeatability of measurements. One vial measured 5× in a row provides results which differs even 2 orders of magnitude. Do you see any mistakes in my procedure below?
I need to be able to quantify about 12 substances, mostly g... |
I was reading about hybridisation and came across a point saying that d3s hybridisation involves only d(x-y), d(y-z), and d(z-x) orbitals and not d(x^2-y^2) nor d(z^2). Why is that so? |
D3S hybridisation involves only d(x-y),d(y-z),d(z-x)? |
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/cD4VV.png
It is given in my book that the structure in *figure-1* is the unit cell of hcp structure.
So why then is the structure in *figure-2* not the unit cell as we can repeat the structure in *figure-2* to get the original hcp... |
What is the nature of the reaction of attack of fluorine gas on aluminum metal? Is it spontaneous in nature?
I have studied reactions of halogens on aluminum but it had no information about the attack of fluorine and I would like to know about this reaction. |
What is the nature of the reaction of attack of fluorine gas on aluminum metal? Is it spontaneous in nature?
I have studied reactions of halogens on aluminum but it had no information about the attack of fluorine and I would like to know about this reaction.
Aluminium has a tenacious oxide layer so the reaction o... |
Following the @Nilay Ghosh recommendation, I found [an SDS sheet][1] for $\ce{Cu2[HgI4]}$ and there is [SDS][2] for $\ce{HgI2}$.
**For $\ce{Cu2[HgI4]}$:**
- Acute toxicity estimate Oral (Expert judgment): 5,1 mg/kg
- Acute toxicity estimate Inhalation (Expert judgment) 4 h: 0,051 mg/l
- Acute toxicity estimate De... |
During the electrolysis of water we have gotten 10dm3 of hydrogen. Temperature was 0°C and pressure was 101325 Pa. What charge has passed trough the electrolysis article/joint?
|
>During the electrolysis of water we have gotten $\pu{10 dm3}$ of hydrogen. Temperature was $\pu{0 °C}$ and pressure was $\pu{101325 Pa}$.
What charge has passed trough the electrolysis article/joint?
|
>During the electrolysis of water we have gotten $\pu{10 dm3}$ of hydrogen. Temperature was $\pu{0 °C}$ and pressure was $\pu{101325 Pa}$.
What charge has passed trough the electrolysis article/joint?
I don't know how to find the charge while knowing pressure, temperature and volume. How do I proceed with this qu... |
What is the nature of the reaction of attack of fluorine gas on aluminum metal? Is it spontaneous in nature?
I have studied reactions of halogens on aluminum but it had no information about the attack of fluorine and I would like to know about this reaction.
> Aluminium has a tenacious oxide layer so the reaction... |
In the synthesis of Panacene by Canesi *et al.* [[1][1]], a step involves the installation of an $\ce{-OH}$ group on a double bond, using the oxymercuration-demercuration procedure. However, the product happens to be a hemiacetal, as shown in the picture. With a 78% yield, it seems that the hemiacetal is not reactive t... |
Im getting mixed answers. Some say these are identical molecules. Other say these are enantiomers. Which is correct and why?
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/KNiBy.jpg |
Enantiomers or identical structure? |
[![enter image description here][1]][1]
---
Obviously, A would be **3-Bromoo 3-methyl cyclo hexene**:
[![enter image description here][2]][2]
as the stable free radical intermediate would be formed.
But B is what I am having problems with. I read that $\ce{LiAlH4}$ forms alkenes with three degree h... |
I have worked with a somewhat long reaction sequence and got stuck on this last step. Im not sure if the entire sequence is even correct but this is what i came up with. Is this a possible reaction, if so, what is the product?
Thanks
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/faahu.... |
Chloral consists of two OH bonds on the same carbon, which is usually unstable, and leads to the evolution of a water molecule, and converts into an aldehyde. However, this is not observed in chloral, and there must be a reason for this.
I have come up with 2 possibilities:
1. hydrogen bonding in chloral, although... |
>[OP] The equilibrium constant would not include the solid $\ce{I2}$, but why is this?
Let me explain this with a different example. If you have a saturated solution (e.g. lemonade with too much sugar in it) it is at equilibrium. If you add more sugar, the lemonade does not get sweeter. That tells you that the amoun... |
>[OP] The equilibrium constant would not include the solid $\ce{I2}$, but why is this?
Let me explain this with a different example. If you have a saturated solution (e.g. lemonade with too much sugar in it) it is at equilibrium. If you add more sugar, the lemonade does not get sweeter. That tells you that the amoun... |
When in a closed container a small amount of liquid is introduced then at a fixed temperature $T$ we will have a vapor-liquid equilibrium and the pressure of the vapor at that temperature is called vapor pressure. In order to derive the relation between vapor pressure and temperature we must equate their chemical poten... |
>[OP] The equilibrium constant would not include the solid $\ce{I2}$, but why is this?
Let me explain this with a different example. If you have a saturated solution (e.g. lemonade with too much sugar in it) it is at equilibrium. If you add more sugar, the lemonade does not get sweeter. That tells you that the amoun... |
I plan to use ImageJ to analyze some fluorescence experiments where the pH changes. I will be using fluorescein as the indicator for the pH changes and it will be present in low concentration (like is typically the case when any indicator is used to measure a pH change).
As I understand it, I can get the relative fl... |
In class we did an experiment to measure chloride in different water sources, including a lake. We used Ion-selective electrode of Ag/AgCl technique.
We did the calibration curve and all steps and measurments in different sources of water are consistent, for example drinking water was a bit below 250ppm. But when me... |
> 1. How would you deal with a user who produced a steady stream of valuable answers, but tends to generate a large number of arguments/flags from comments?
I would look into what caused the flags and arguments. Many flags on this forum are for outdated posts and we have a pretty wholesome community. However, if the... |
Suppose a gas is effusing from a container through a small orifice at constant temperature and pressure. Does the rate of effusion (no of moles of gas effused per unit time) remain constant throughout the effusion or does it decrease with time as the no. of moles of the gas decrease in the container? |
Does the rate of effusion remain constant throughout the effusion? |
Prologue/Rant about online classes
We have been taught the electron sea model to explain metallic bonding and conduction of electricity by metals. Then out of the blue, the band theory was introduced, without even giving the definition of what a band is. So I was lost in the recorded online class with no method of ... |
What makes up the conduction band? |
For cooling of a measurement device (HPGE) i need around 30 Liters of LN2 (Liquid Nitrogen). I'm a hobbyist but, familiar with the basic rules of Ln2 (Eyeshield,Gloves, Ventilation, Pressure Danger) and also have a professional O2 sensor by hand.
My current problem is, that i own a special 30L dewar for the detector... |
We know that Dilute H<sub>2</sub>SO<sub>4</sub> doesn't react with Copper because Copper has higher reduction potential (0.33) as compared to Hydrogen(0.00).
**But why it reacts with Conc. H<sub>2</sub>SO<sub>4</sub> and give CuSO<sub>4</sub> with SO<sub>2</sub> and H<sub>2</sub>O?** |
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