To change the pH of a solution from 1 to 1.301 which of the following should be adopted ?

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1 kg of water is to be added

1 lit of water is to be added

The volume of the solution should be doubled by adding water

The weight of the solute present in the solution should be doubled

answer is C.

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Detailed Solution

${(P^{H})}_{i} = 1; {[H^{+}]}_{i} = 10^{- 1} \Rightarrow \frac{n}{V_{i}} = 10^{- 1} P_{f}^{H} = 1.3; {[H^{+}]}_{f} = 5 \times 10^{- 2} \Rightarrow \frac{n}{V_{f}} = 5 \times 10^{- 2} ∴ \frac{V_{f}}{V_{i}} = \frac{10^{- 1}}{5 \times 10^{- 2}} = \frac{10}{5} = 2$

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