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+]=10−1=0.1M pH=2∴[H+]=10−2=0.01M
For dilution of HCl, M1V1=M2V2 0.1×1=0.01×V2 V2=10L
Volume of water to be added = 10 - 1 = 9 L