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16 March, 03:24

Calcium hydroxide is partially soluble as shown by the

following reaction:

Ca (OH) 2 (s) → Ca2 + (aq) + 20H (aq)

What is the pOH of a 5 x 10-5 M Ca (OH) 2 solution?

pH = __

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Answers (1)
  1. 16 March, 03:25
    0
    4

    10

    Explanation:

    The reaction equation is given as;

    Ca (OH) ₂ → Ca²⁺ + 2OH⁻

    Concentration of Ca (OH) ₂ = 5 x 10⁻⁵M

    Unknown:

    pOH of the solution = ?

    pH of the solution = ?

    Solution:

    Solve for the pOH of this solution using the expression below obtained from the ionic product of water;

    pOH = ⁻log₁₀[OH⁻]

    Ca (OH) ₂ → Ca²⁺ + 2OH⁻

    1moldm⁻³ 1moldm⁻³ 2 x 1moldm⁻³

    5 x 10⁻⁵moldm⁻³ 5 x 10⁻⁵moldm⁻³ 2 (5 x 10⁻⁵moldm⁻³)

    1 x 10⁻⁴moldm⁻³

    Therefore;

    pOH = - log₁₀ 1 x 10⁻⁴ = 4

    Since

    pOH + pH = 14

    pH = 14 - 4 = 10
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