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Question

An aqueous solution of HCI has a pH of 2.0. When water is added to increase the pH to 5.0, the hydrogen ion concentration

A
remains the same
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B
decreases three-fold
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C
increases three-fold
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D
decreases thousand-fold
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Solution

The correct option is D decreases thousand-fold
pH=2[H+]i=102M
pH=5[H+]t=105M
[H+]f[H+]i=105102=(11000)
So, H+ concentration decreases thousand fold.

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