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  4. A solution of weak acid is diluted by adding an equal volume of water. Which of the following will not change?

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Q. A solution of weak acid is diluted by adding an equal volume of water. Which of the following will not change?

JIPMERJIPMER 1995

Solution:

On adding equal volume of water, the degree of dissociation of acid also increases (according to Ostwalds law), hence, the concentration of $ {{H}^{+}} $ ions remains almost constant.