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Question

At a certain temperature for a aqueous solution, the value of pKw is 13.4 and the measured pH of the solution is 7. What is the nature of the solution?

A
Acidic
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B
Basic
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C
Neutral
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D
Unpredictable
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Solution

The correct option is B Basic

Since, for a neutral solution [H+]=[OH]
and kw=[H+][OH]
From the definition of pH and pKw the relation between the two is :
pH=12pKw
At this temperature , pH of neutral solution would be =13.42=6.7
6.7 is the neutral pH for this solution. So, pH greater than 6.7 at this temperature should be the basic solution.
As, the measured pH of the solution is 7 which is greater than 6.7 , So the given solution is basic in nature.


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