why does phenolphthalein remain colorless
Slowly pour the contents of the first cup into the second cup. At first, the pouring will result in a red color. With continued pouring, the acid will neutralize the base, and the red color will disappear. I know that phenolphthalein turns pink in basic solutions and is colorless in acidic solutions.That's why it was colorless in sulfuric acid at first. But what I don't understand is how come the phenolphthalein turned pink when the contents of the first cup was poured into the second cup.lowly pour the contents of the first cup into the second cup. At first, the pouring will result in a red color. With continued pouring, the acid will neutralize the base, and the red color will disappear. I know that phenolphthalein turns pink in basic solutions and is colorless in acidic solutions.