A cup of coffee has a hydroxide ion concentration of 1 $\times$10^-¹⁰ M.What is the pH of this coffee?

Question

Quizplus · Accepted Answer

The given hydroxide ion concentration of the coffee is 1x10^-10 M. To find the pH, we need to use the equation pH = -log[H+], where [H+] is the concentration of hydrogen ions in the solution. Since this is a basic solution with a hydroxide ion concentration, we need to use the pOH equation, pOH = -log[OH-] = -log(1x10^-10) = 10. Taking the negative (inverse) of the pOH gives us the pH: pH = 14 - pOH = 14 - 10 = 4. Therefore, the answer is (B).

A Cup of Coffee Has a Hydroxide Ion Concentration of 1