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pH = -log(concentration of H+ ion) which indicates acid

pOH = -log(concentration of OH- ion) which indicates base

In pure water at 25 degree Celsius, concentration of H+ and OH- is equal i.e. 10^-7 mol/dm^3

so, the sum of pH and pOH is -log(10^-7) + -log(10^-7) = 7 + 7 = 14

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