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Question

The pH values for three different solutions are 13, 11 and 9. Arrange these pH values in the decreasing order of hydronium or H+ ion concentration.

A
13>11>9
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B
9>11>13
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C
9>13>11
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D
11>13>9
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Solution

The correct option is A 9>11>13
We know pH=log [H+]
Hydronium ion concentration = 10pH
Hydronium ion concentration in pH=13 is 1013, in pH=11 is 1011 and in pH=9 is 109.
Therefore, the pH values in the decreasing order of hydronium or H+ ion concentration are as follows:
9>11>13

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