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Gekata [30.6K]
3 years ago
10

At 25 °C, what is the hydroxide ion concentration, [OH-], in an aqueous solution with a hydrogen ion concentration of

Chemistry
1 answer:
Otrada [13]3 years ago
6 0

The hydroxide ion concentration, [OH-] = 2.439 x 10⁻¹⁰

<h3>Further explanation</h3>

Equilibrium of water and the ions :

\tt 2H_2O(l)\rightarrow H_3O^+(aq)+OH^-(aq)

\tt Kc=\dfrac{[H_3O^+][OH^-]}{H_2O}

Kc[H₂O] is the ion equilibrium constant for water ⇒ Kw.

The product of the concentrations of these ions (H₃O⁺ and OH⁻)at equilibrium at 25°C is 1.0 x 10⁻¹⁴ M

[H₃O⁺] [OH⁻] = 1.0 x 10⁻¹⁴ M = Kw

The hydrogen ion concentration of  [H⁺]=4.1 x 10⁻⁵ M, so  the hydroxide ion concentration, [OH-] :

\tt 4.1\times 10^{-5}\times [OH^-]=1.10^{-14}\\\\(OH^-]=\dfrac{1.10^{-14}}{4.1\times 10^{-5}}\\\\(OH^-]=2.439\times 10^{-10}

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