What kind of environment does ammonia solution in water have? What color does phenolphthalein have in ammonia solution? Why does this color disappear when adding hydrochloric acid solution?
A solution of ammonia in water has an alkaline medium, therefore phenolphthalein in an ammonia solution has a raspberry color. As hydrochloric acid is added, the ammonium chloride salt is formed, which is formed by a weak base and a strong acid. The salt is cationically hydrolyzed and the solution medium is acidic. In an acidic environment, phenolphthalein is colorless.
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