What is the pH of 0.001 mol dm-3 solution of sodium hydroxide
\([H^+] [OH^-] = 10^{-14}\) \([H^+] = 10^{-14}/[OH^-] = 10^{-14}/(1 * 10^{-3}) = 10^{-11}\) pH = -Log10[H+] = - Log10[10-11] = - 1 * -11 Log10[10-11] = 1 = -1 * -11 * 1 = 11
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