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25 March, 14:24

You can calculate the acid dissociation constant of a weak acid from experimental data

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  1. 25 March, 16:26
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    The generic equilibrium constant expression for a weak acid is written as follows.

    If the acid is strong enough to ignore the dissociation of water, the H3O + ion and A - ion concentrations in this solution are about equal.

    [H3O+] [A-]

    Substituting this information into the acid-dissociation equilibrium constant expression gives the following result.

    The concentration of the HA molecules at equilibrium is equal to the initial concentration of the acid minus the amount that dissociates: C.

    If C is small compared with the initial concentration of the acid, we get the following approximate equation.

    Rearranging this equation and taking the square root of both sides gives the following result.
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