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Question

# The pH of a certain centimolar solution of a monobasic acid HA is 6.0. The dissociation constant of the acid is approximately equal to:

A
1012
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B
108
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C
1010
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D
106
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Solution

## The correct option is C 10−10The concentration of centimolar solution is 0.01 M and its pH is 6.0. Its hydrogen ion concentration will be 10−6M.The relationship between the hydrogen ion concentration and dissociation constant is [H+]=√Ka×cSubstitute values in the above expression,10−6=√Ka×0.01Hence, Ka=10−10.Option C is correct.

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