When phenolphthalein is added to vinegar, the solution becomes . . . . . . . . A. Pink B. blue C. red D. colourless

The correct answer is D. colourless.

Phenolphthalein is an indicator that is colorless in acidic solutions and pink in basic solutions. Vinegar is an acidic solution, so when phenolphthalein is added to vinegar, the solution remains colorless.

Option A is incorrect because phenolphthalein

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