How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2 ? - Chemistry MCQ JEE Main 2026 | ExamTest.live

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

Solution & Step-by-step Explanation

Initial state: pH = 1 \Rightarrow [H^{+}] = 1 0^{- 1} = 0.1 M . V_{1} = 1 L .Final state: pH = 2 \Rightarrow [H^{+}] = 1 0^{- 2} = 0.01 M . V_{2} = ? Using the dilution formula M_{1} V_{1} = M_{2} V_{2} : 0.1 \times 1 = 0.01 \times V_{2} V_{2} = \frac{0.1}{0.01} = 10 L Volume of water to be added = V_{2} - V_{1} = 10 - 1 = 9 L .

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

0.9 L

2.0 L

9.0 L

0.1 L

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