Sean asked in Science & MathematicsChemistry · 2 months ago

What is the [Tl3+] in a solution that is buffered at pH 11.50 at 25 °C? The Ksp of Tl(OH)3 is 2 × 10–44 at 25 °C.?

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  • 2 months ago

    pOH = pKw - pH = 14.00 - 11.50 = 2.50

    [OH⁻] = 10⁻²·⁵⁰ M

           Ti(OH)₃(s)  ⇌  Ti³⁺(aq)  +  3OH⁻(aq)        Ksp = 2 × 10⁻⁴⁴

    Initial:                      0 M           10⁻²·⁵⁰ M

    Change:                +s M            +3s M

    Eqm:               s M        (10⁻²·⁵⁰ + 3s) M

                                                    ≈ 10⁻²·⁵⁰ M

    At equilibrium:

    Ksp = [Ti³⁺] [OH⁻]³

    2 × 10⁻⁴⁴ = s (10⁻²·⁵⁰)³

    s = (2 × 10⁻⁴⁴) / (10⁻²·⁵⁰)³

    s = 6.3 × 10⁻³⁷

    [Ti³⁺] = 6.3 × 10⁻³⁷ M

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