Question

substances that release (donate) hydrogen ions (h⁺) in a solution are known as ______.
bases
salts
acids
buffers

Explanation:

According to the Arrhenius - acid base theory, acids are substances that release hydrogen ions ($H^{+}$) in an aqueous solution. Bases release hydroxide ions ($OH^{-}$), salts are products of acid - base reactions, and buffers resist changes in pH.

Answer:

C. acids