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5 January, 10:39

Calculate the concentration of H3O + of a solution if the concentration of OH - at 25°C is 3.8 * 10-5 M and determine if the solution is acidic or basic.

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  1. 5 January, 12:50
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    [H₃O⁺] = 2.63*10⁻¹⁰ M

    As pH = 9.57, the solution is basic

    Explanation:

    We must know this knowledge:

    [OH⁻]. [H₃O⁺] = 1*10⁻¹⁴

    3.8*10⁻⁵. [H₃O⁺] = 1*10⁻¹⁴

    [H₃O⁺] = 1*10⁻¹⁴ / 3.8*10⁻⁵ → 2.63*10⁻¹⁰ M

    Let's determine the pH to state if the solution is acidic or basic

    pH 7 → basi

    pH = - log [H₃O⁺]

    pH = - log 2.63*10⁻¹⁰ → 9.57
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