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

Correct answer

9

Step-by-step solution

p H = 1 H + = 1 0 - 1 = 0.1 M p H = 2 H + = 1 0 - 2 = 0.01 M For dilution of HCl, we have M 1 V 1 = M 2 V 2 0.1 × 1 = 0.01 × V 2 V 2 = 10 litre Volume of water added = 10 - 1 = 9 litre

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