acwoods1897 acwoods1897

20-02-2020
Chemistry

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The K w for water at 0 ∘ C is 0.12 × 10 − 14 . Calculate the pH of a neutral aqueous solution at 0 ∘ C.

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anfabba15 anfabba15

20-02-2020

Answer:

pH = 7.46

Explanation:

2H₂O ⇄ H₃O⁺ . OH⁻ Kw = [H₃O⁺] . [OH⁻]

[H₃O⁺] = [OH⁻]

√0.12×10⁻¹⁴ = [H₃O⁺] → 3.46×10⁻⁸ M

- log [H₃O⁺] = pH

- log 3.46×10⁻⁸ = pH → 7.46

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