Which of the following will occur if $1.0 M$ solution of a weak acid is diluted to $0.01 M$ at constant temperature?

[H^{+}]

will decrease to

0.01 M

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pH will decrease by 2 units

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K_{a}

will increase

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Percentage ionisation will increase

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Solution

The correct option is B Percentage ionisation will increase
For weak acid
$α = \sqrt{\frac{K_{a}}{C}}$
On dilution volume increases and concentration decreases so $α$ will increase. $[H]^{+}$ will remain same so $p H$ will also remain same.

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