40 mg of pure sodium hydroxide is dissolved in 10 litre of distilled water. The pH of the solution i

Question

40 mg of pure sodium hydroxide is dissolved in 10 litre of distilled water. The pH of the solution is

Professor PC Thomas Classes · Answer

40 mg NaOH is $10^{-3}$ moles. In 10 L, $[OH^-] = 10^{-4}$ M. pOH = 4, thus pH = 10.