At 60°c, the ion-product constant of water, kw, is 9.25 * 10-14. what is the ph of pure water at 60°c?

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Chemistry

24 October, 16:57

At 60°c, the ion-product constant of water, kw, is 9.25 * 10-14. what is the ph of pure water at 60°c?

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Miller · Answer 1

6.517.

Explanation:

It is known that for pure water: [H₃O⁺] = [OH⁻], so water is neutral.

It also is known that:

Kw = [H₃O⁺][OH⁻] = 9.25 x 10⁻¹⁴.

∵ [H₃O⁺] = [OH⁻].

∴ [H₃O⁺]² = 9.25 x 10⁻¹⁴.

∴ [H₃O⁺] = √ (9.25 x 10⁻¹⁴) = 3.041 x 10⁻⁷ M.

∵ pH = - log[H₃O⁺]

∴ pH = - log (3.041 x 10⁻⁷) = 6.517.