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What is the pKW at 298 k?

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in Chemistry – Class 11 by (148k points)
What is the pKW at 298 k?

(a) 14

(b) 7

(c) 1

(d) 0

This question was posed to me in unit test.

I'd like to ask this question from Equilibrium in section Equilibrium of Chemistry – Class 11

1 Answer

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Best answer
Correct option is (a) 14

The best explanation: We know that the ionization constant of water at 298 k is given by [H3O^+][OH^–] =  1 x 10^-14/mol^2L^2. pKW = pH + pOH = -log[H3O^+] – log[OH^–] = -log[H3O^+][OH^–] = -log10^-14 = log10^14 = 14. Therefore pKW at 298 k is 14.

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