Question

a solution that contains more hydrogen ions (h⁺) than hydroxide ions (oh⁻)
fill in the blank

Explanation:

In chemistry (a subfield of Natural Science), a solution with a higher concentration of hydrogen ions ($\ce{H+}$) than hydroxide ions ($\ce{OH-}$) is defined as an acidic solution. This is based on the concept of pH and the ion concentration in aqueous solutions, where acidic solutions have $[\ce{H+}] > [\ce{OH-}]$.

Answer:

acidic (or acid)