A mixture is made by adding 25.0 mL of 0.10 M KOH(aq)to 25.0 mL of water. At 25.0 °C, what is its pH?

Question

Quizplus · Accepted Answer

The pH of a solution is determined by the concentration of hydrogen ions in the solution. The higher the concentration of hydrogen ions, the lower the pH. In this case, the KOH solution is a base, which means that it will donate hydroxide ions to the water. The hydroxide ions will react with the water to form hydrogen ions and hydroxide ions. The equilibrium constant for this reaction is very large, which means that the reaction will proceed to completion. This means that all of the KOH will be converted to hydrogen ions and hydroxide ions. The concentration of hydrogen ions in the solution will be equal to the concentration of KOH, which is 0.10 M. The pH of the solution will be:```pH = -log[H+] = -log(0.10) = 1.00```Therefore, the correct answer is B) 12.70.

A Mixture Is Made by Adding 25