Question

multiple choice 1 point which of the following functional groups decreases the concentration of hydrogen ions in a solution? amino hydroxyl carbonyl carboxyl

Explanation:

Hydrogen ion ($\text{H}^+$) concentration decreases when a group accepts $\text{H}^+$ or releases hydroxide ions ($\text{OH}^-$) to neutralize $\text{H}^+$. Amino groups ($-\text{NH}_2$) act as weak bases, accepting $\text{H}^+$ from solution to form $-\text{NH}_3^+$, thus lowering $\text{H}^+$ concentration. Hydroxyl groups are neutral, carbonyl groups do not affect $\text{H}^+$ concentration, and carboxyl groups release $\text{H}^+$, increasing its concentration.

Answer:

Amino