| {"task_index": 0, "task": "Perform the acid–base titration by opening the burette stopcock and adding titrant until the solution in the Erlenmeyer flask changes from colorless to a stable pale pink, then stop the titration immediately."} | |
| {"task_index": 1, "task": "Use the right robotic arm to operate the burette stopcock, gradually deliver the titrant into the phenolphthalein-containing acid solution, and close the stopcock as soon as a stable pale-pink endpoint appears."} | |
| {"task_index": 2, "task": "Position the right gripper toward the burette stopcock and rotate it counterclockwise to begin dispensing. Then rotate the stopcock clockwise in controlled stages until the Erlenmeyer-flask solution becomes uniformly and persistently pale pink, and immediately close the stopcock completely."} | |
| {"task_index": 3, "task": "Start the titration by turning the burette stopcock counterclockwise with the right gripper. Add titrant in small, controlled increments, and fully shut the stopcock when the initially colorless solution just becomes stable pale pink."} | |
| {"task_index": 4, "task": "With the right robotic arm facing the burette stopcock, rotate the stopcock counterclockwise to release titrant. Continue the titration using intermittent clockwise adjustments, stopping and closing the stopcock completely when a stable pale-pink color is observed."} | |
| {"task_index": 5, "task": "Operate the burette stopcock with the right gripper: turn it counterclockwise to initiate flow, then regulate the flow through successive clockwise turns. Stop immediately when the acid solution containing phenolphthalein reaches a uniform, stable pale-pink color."} | |
| {"task_index": 6, "task": "Rotate the burette stopcock counterclockwise to start adding titrant to the Erlenmeyer flask. Turn it clockwise step by step while monitoring the solution, and completely close it at the first persistent pale-pink endpoint."} | |
| {"task_index": 7, "task": "Use the right arm to open the burette stopcock by counterclockwise rotation. Deliver the titrant gradually, and when the colorless solution changes to a stable light pink corresponding to the titration endpoint, close the stopcock immediately."} | |
| {"task_index": 8, "task": "Face the right gripper toward the burette stopcock and rotate counterclockwise to allow titrant to enter the phenolphthalein-containing acid solution. Regulate the addition with clockwise rotations and terminate the operation when a persistent pale-pink color develops."} | |
| {"task_index": 9, "task": "Begin the acid–base titration by turning the stopcock counterclockwise with the right robotic gripper. Adjust it clockwise in stages to control titrant delivery, then turn it to the fully closed position as soon as the solution remains pale pink."} | |
| {"task_index": 10, "task": "Open the burette stopcock using a counterclockwise rotation of the right gripper. Add titrant under controlled flow conditions until the solution changes from colorless to just-persistent pale pink, then immediately stop the flow by fully closing the stopcock."} | |
| {"task_index": 11, "task": "Use the right robotic arm to rotate the burette stopcock counterclockwise and initiate titrant flow. Apply successive clockwise rotations to reduce and control the flow, and close the stopcock completely once the solution has a stable pale-pink appearance."} | |
| {"task_index": 12, "task": "Start dispensing titrant by rotating the stopcock counterclockwise. While observing the Erlenmeyer flask, make gradual clockwise adjustments and stop the titration immediately when the phenolphthalein endpoint is reached, indicated by a uniform stable pale pink."} | |
| {"task_index": 13, "task": "Direct the right gripper at the burette stopcock, turn it counterclockwise to begin titration, and then control the addition with phased clockwise turns. Fully close the stopcock at the moment the solution becomes persistently pale pink."} | |
| {"task_index": 14, "task": "Carry out the titration with the right robotic arm by first rotating the burette stopcock counterclockwise. Add titrant progressively using clockwise adjustments, and terminate delivery immediately when the solution changes from colorless to stable pale pink."} | |
| {"task_index": 15, "task": "Rotate the burette stopcock counterclockwise to release titrant into the acid sample containing phenolphthalein. Continue with controlled clockwise rotation until a stable light-pink color appears throughout the solution, then close the stopcock fully without delay."} | |
| {"task_index": 16, "task": "Use the right gripper to face and turn the burette stopcock counterclockwise, initiating the titrant flow. Regulate the flow through discrete clockwise turns and immediately return the stopcock to the fully closed position at the stable pale-pink endpoint."} | |
| {"task_index": 17, "task": "Begin adding titrant by counterclockwise operation of the burette stopcock with the right arm. Monitor the Erlenmeyer flask continuously, make clockwise adjustments in stages, and stop as soon as the colorless solution is stably pale pink."} | |
| {"task_index": 18, "task": "Perform the endpoint titration by opening the stopcock counterclockwise, delivering titrant in controlled increments, and closing the stopcock completely at the first stable pale-pink coloration of the phenolphthalein-containing solution."} | |
| {"task_index": 19, "task": "Position the right robotic gripper toward the burette stopcock and rotate counterclockwise to start titrant delivery. Rotate clockwise stepwise while monitoring the flask, and immediately stop and fully close the stopcock when the solution has changed to a persistent pale pink, indicating the endpoint."} | |