AIIMS2018Chemistry-Acids and Bases
AIIMS 2018 Chemistry Indicators MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Choose the correct.

Correct Answer
Option A
Detailed Explanation
At the neutral point of the titration of CH₃COOCH₃ (methyl acetate) with NaOH, phenolphthalein transitions from pink to colourless due to the formation of CH₃COOH (acetic acid), which is a weak acid. The reaction CH₃COOCH₃ + H₂O → CH₃COOH + CH₃OH indicates that acetic acid dissociates partially in solution, leading to a decrease in pH, which causes the phenolphthalein indicator to lose its pink color. Since the other options are not provided, they cannot be evaluated, but it is important to note that any incorrect options would likely misrepresent the chemical behavior of the reactants or the indicator in this titration scenario.
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