chemistry

Lactic acid, HC3H5O3(aq) is a weak acid that gives yougurt its sour taste(Yeeeeecccckkk). Calculate the pH of a 0.0010 mol/L solution of Lactic acid. The Ka for lactic acid is 1.4 x 10^-4

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  1. Let's call Lactic acid HL.
    HL ==> H^+ + L^-

    Ka = (H^+)(L^-)/(HL) = 1.4 x 10^-4

    initially before ionization:
    (HL) = 0.001 M
    (H^+) = 0
    (L^-) = 0

    change:
    (H^+) = +x
    )L^-) = +x
    (HL) = 0.001 - x

    equilibrium:
    (H^+) = +x
    (L^-) = +x
    (HL) = 0.001 - x

    Substitute the equilibrium values shown into the Ka expression and solve for x.
    Then convert (H^+) to pH by pH = -log(H^+)

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    posted by DrBob222

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