First slide

PH of strong acids and strong bases

Question

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

Easy

A

1 lit of water is to be added
B

1 kg of water is to be added
C

The volume of the solution should be doubled by adding water
D

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

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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