What does an acid do to an alkali?

Answer 1

An equal amount of both would neutralize each other producing water and a corresponding salt..but be careful, randomly adding an acid to a base might produce a poisonous gas or so, so please be careful about it and make sure what you are using is safe...we care for your health after all.. :D

Answer 2

When an acid reacts with an alkali, a neutralization reaction occurs in which the acid donates a hydrogen ion (H+) to the alkali, forming water and a salt. The pH of the solution generally moves towards neutral (pH 7) as the reaction takes place.

Answer 3

It neutralises. For instance if you have hydrochloric acid and add universal indicator, then add sodium hydroxide (alkali) it turns green. (pH value 7, neutral).