Question

A 25 mL solution of nitric acid was placed in a flask and a few drops of phenolphthalein were added. Dilute sodium hydroxide was added util the indicator changed colour. It was found that 28 mL of the alkali was used.
(a) What colour was the solution in the flask at the start of the titration?
(b) What colour did it turn to when acid had been neutralized?
(c)Was the alkali more concentrated or less concentrated than the acid?

Answer 1

If you performed this experiment why don't you know the color before and after?

Answer 2

If it took more alkali (28 mL vs 25 mL HNO3), then the acid was more concentrated than the alkali.