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Question

A solution has pH=5. It is diluted 100 times, then it will become :

A
Neutral
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B
Basic
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C
Unakected
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D
More acidic
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Solution

The correct option is A Neutral
pH=5
[H2O]+=10pH;LetV1=x,V2=100x,M2=?
According to dilution law,
M1V1=M2V2
105x=M2100x
105x100x=M2 or M2=107
[H3O+]=107+107 M from water
$ -2 \times
10^{-7}\, M$
pH=log[H3O+]=log(2×107)=6.69
Hence, solution becomes almost neutral.

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