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Question

What is pH of 2×108 M HCl solution?


(Here, log 2=0.301 and log 3=0.477)

A
6.92
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B
9.5
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C
5.4
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D
7.7
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Solution

The correct option is A 6.92
As solution is very dilute,
[H+]=[H+]water+[H+]HCl

=107+2×108=12×108

pH=log[12×1018]

=log[22×3×108]

=[2 log(2)+ log(3)+ log(108)= 6.92.

Option A is correct.

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