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? asked in Science & MathematicsChemistry · 1 decade ago

Calculate the acid ionization constant for the acid?

A 0.120 M solution of a weak acid (HA) has a pH of 3.29. Calculate the acid ionization constant (Ka) for the acid using two significant figures.

Please show how to do this in great detail?

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  • Caroline Miller
    Lv 7
    1 decade ago
    Favorite Answer

    pH = 3.29 so [H+] = 10^-3.29 = 5.13x10^-4M

    Ka = [H+][A-] / [HA]

    Ka = x^2 / 0.12-x

    Ka = (5.13x10^-4)^2 / (0.12 - 5.13x10^-4) = 2.2x10^-6

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