How can you identify if a chemical is an acid?

Answer 1

A chemical can be identified as an acid by testing its pH. A pH value less than seven is considered acidic, while a pH value greater than seven is considered to be a base, or alkaline. Pure water has a pH value of seven.

Answer 2

Acids generally have a sour taste, can cause a stinging sensation on the skin, and can turn blue litmus paper red. They also release hydrogen ions (H+) when dissolved in water. pH testing can also help determine if a substance is an acid, as acids typically have a pH below 7.