For a weak acid,the incorrect statement is

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(B) For a weak acid,the dissociation constant $(K_a)$ is very low,which implies that the $pK_a$ $(pK_a = -\log K_a)$ is high. Therefore,the statement

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Its $pK_a$ is very low

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(B) For a weak acid,the dissociation constant $(K_a)$ is very low,which implies that the $pK_a$ $(pK_a = -\log K_a)$ is high. Therefore,the statement that its $pK_a$ is very low is incorrect,as a very low $pK_a$ is characteristic of a strong acid. Weak acids are only partially dissociated in solution. The salt of a weak acid and a strong base (e.g.,$CH_3COONa$) undergoes anionic hydrolysis,making the solution alkaline.

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