Question

Why did the red color disappear after adding vinegar to the ammonia solution?

Answer 1

Acids turn the indicator red, pink, orange, and yellow, while bases turn it green, blue, and purple. ... Ammonia is a base, so when you mixed the acidic vinegar solution with ammonia, it raised the pH and the water turned blue. If you had enough vinegar in your last flask, the solution should have turned red again.

Answer 2

Explanation:

Acids turn the indicator red, pink, orange, and yellow, while bases turn it green, blue, and purple. ... Ammonia is a base, so when you mixed the acidic vinegar solution with ammonia, it raised the pH and the water turned blue. If you had enough vinegar in your last flask, the solution should have turned red again.