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10 October, 21:35

Calculate the concentration of an aqueous solution of Ca (OH) 2 that has a pH of 12.01. Express your answer using two significant figures.

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  1. 10 October, 21:59
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    The concentration of Ca (OH) ₂ aqueous solution of pH 12.01 is 0.0051 M

    Explanation:

    Because in water, the selft ionization constant of water is [H⁺][OH⁻] = 10⁻¹⁴ or pH + pOH = 14

    Given pH = 12.01, so pOH = 14 - 12.01 = 1.99

    The concentration of OH⁻ is 10^ (1.99) = 0.010 M

    The equation is: Ca (OH) ₂ → Ca²⁺ + 2 OH⁻

    So the concentration of Ca (OH) ₂ (aq) is 0.010 / 2 = 0.0050 M
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