Question

ph is a measure of ______
concentration of oxygen and nitrogen ions in a solution.
concentration of sodium and potassium ions in a solution.
the number of protons in a solution.
concentration of carbon dioxide in a solution.
concentration of hydrogen and hydroxyl ions in a solution.

Explanation:

pH is defined as the negative logarithm of the hydrogen - ion concentration in a solution. It also relates to the concentration of hydroxyl ions as the product of hydrogen - ion and hydroxyl - ion concentrations in an aqueous solution is a constant ($K_w$). So, pH measures the relative amounts of hydrogen and hydroxyl ions in a solution.

Answer:

concentration of hydrogen and hydroxyl ions in a solution.