Question

bio-201 topic 1: anatomy, physiology, homeostasis, and the chemistry of life
practice it
ph is a measure of ______
concentration of sodium and potassium ions in a solution.
concentration of carbon dioxide in a solution.
concentration of oxygen and nitrogen ions in a solution.
concentration of hydrogen and hydroxyl ions in a solution.
the number of protons in a solution.

Explanation:

The pH scale measures the acidity or alkalinity of a solution. It is based on the concentration of hydrogen ions ($H^+$) and hydroxyl ions ($OH^-$). A lower pH indicates a higher concentration of hydrogen ions (more acidic), and a higher pH indicates a higher concentration of hydroxyl ions (more alkaline).

Answer:

concentration of hydrogen and hydroxyl ions in a solution.