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20 August, 07:23

Enter your answer in the provided box. in a 0.740 m solution, a weak acid is 12.5% dissociated. calculate ka of the acid.

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  1. 20 August, 07:31
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    Answer is: the acid dissociation constant for weak acid is 0.0132.

    Chemical reaction: HA (aq) ⇄ A⁻ (aq) + H⁺ (aq).

    c (weak acid) = 0,740 M.

    α (weak acid) = 12,5% : 100% = 0,125.

    Ka = α² · c / 1 - α.

    Ka = 0,125² · 0,740 M / 1 - 0,125.

    Ka = 0,0132 M = 1,32 ·10⁻² M.

    Ka is the acid dissociation constant, which quantifies the extent of acid dissociation (in this example HA) in water.
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