Which of the following will occur when $0.1 M$ solution of a weak acid is diluted to $0.01 M$ at constant temperature?

The percentage of ionization will increase.

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The concentration of

H^{+}

will decrease to

0.01 M

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The value of pH will decrease.

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The value of

K_{a}

will increase.

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Solution

The correct option is C The percentage of ionization will increase.
When a solution of weak acid is diluted from $0.1 M$ to $0.01 M$ , the degree of ionization and the percentage of ionization increases.
In fact, at infinite dilution, it is found that the weak acid is completely ionized and its percentage of ionization is around $100 %$ .

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