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Question

How many litres of water must be added to 1 L of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

A
0.1 L
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B
0.9 L
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C
2.0 L
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D
9.0 L
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Solution

The correct option is D 9.0 L
pH=1 [H+]=101=0.1 M
pH=2 [H+]=102=0.01 M
For dilution of HCl, M1V1=M2V2
0.1×1=0.01×V2
V2=10 L
Volume of water to be added = 10 - 1 = 9 L

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