Answer to Question #134563 in General Chemistry for A

Question

Using phenolphthalein as indicator, what color change is seen at the end point as acid is added to alkali?Please select from below.

pink to paler pink

pale pink to darker pink

pale pink to colorless

colorless to pink

pink to colorless

Answer 1

Phenolphthalein is pink in alkali solution and colorless in acidic solution. The end point of titration should be recorded when the color has changed, but not completely. Therefore, the correct endpoint in this case will be when the solution turns pale pink from pink.

Answer: pink to paler pink