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spayn [35]
4 years ago
14

What is the Ka of a 0.653 m solution of hydrocyanic acid with a ph of 5.47

Chemistry
1 answer:
vredina [299]4 years ago
5 0

Answer:

1.758 x 10⁻¹¹.

Explanation:

∵ pH = - log[H⁺].

∴ 5.47 = -log[H⁺].

log[H⁺] = -5.47.

∴ [H⁺] = 3.388 x 10⁻⁶ M.

∵ [H⁺] = √(Ka.C)

∴ [H⁺]² = Ka.C

<em>∴ Ka = [H⁺]²/C </em>= (3.388 x 10⁻⁶)²(0.653) = <em>1.758 x 10⁻¹¹.</em>

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