The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?
Answer Details
Phenolphthalein is a commonly used acid-base indicator. It is colourless in acidic solutions and pink in basic solutions. Therefore, at the end-point of an acid-base titration, when the solution has become basic, the phenolphthalein indicator will turn pink. Thus, the answer is pink.