On the pH scale, a solution’s pH is primarily a measure of what quantity?

• A. The total concentration of all ions (ionic strength) in the solution
• B. The hydrogen ion concentration, $-\log \left(H_3{O}^{+}\right)$, in the solution
• C. The molar concentration of the solute originally dissolved (regardless of dissociation)
• D. The hydroxide ion concentration, $\log \left(O^{-}H\right)$, in the solution

Answer: (B)