A solution has [h3o+] = 4.2*10-5 m. use the ion product constant of water kw=[h3o+][oh-] to find the [oh-] of the solution.

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Chemistry

Eli Lara

Today, 05:20

A solution has [h3o+] = 4.2*10-5 m. use the ion product constant of water kw=[h3o+][oh-] to find the [oh-] of the solution.

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Lance Lamb · Answer 1

Answer is: concentration of hydroxide ions is 2.38·10⁻¹⁰ M.

[ H₃O⁺] = 4.2·10⁻⁵ M; equilibrium concentration of hydroxide ions.

The Kw (the ionic product for water) at 25°C is 1·10 ⁻¹⁴ mol²/dm⁶ or 1·10⁻¹⁴ M².

Kw = [H ₃O⁺] · [OH⁻ ].

[ OH⁻] = Kw : [H₃O⁺ ].

[ OH⁻] = 1·10⁻¹⁴ M² : 4.2·10⁻⁵ M.

[ OH⁻] = 2.38·10⁻¹⁰ M.