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 ?

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0.1 L

0.9 L

2.0 L

9.0 L

answer is D.

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Detailed Solution

pH = 1∴ H+ = 10-1 = 0.1 MpH = 2∴ H+ = 10-2 = 0.01 MFor dilution of HCl,M1V1 = M2V20.1 × 1 = 0.01 × V2V2 = 10 LVolume of water required = 10-1 = 9 lits

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