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Weak acid , determination of Ka

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Phenylacetic acid (C6H5CH2COOH) is one of the substances that accumulates in the blood of people with phenylketonuria, and inherited disorder that can cause mental retardation or even death. A 0.085 M (mol/L) solution of C6H5CH2COOH has a pH of 2.68. Calculate the Ka value for this acid.

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Calculations are provided to calculate stepwise acid dissociation constant Ka in word document.

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    Acetic acid is a weak acid; for a weak acid, we have the conc. of H+ ions as,

    [H+] = xC = (Ka C)^1/2 = (1.76 * 10^-5 * 0.01)^1/2

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