First slide

PH scale, PH of strong acids and strong bases

Question

The pH of a 1 lit solution is 2. It is diluted with water till its pH becomes 4. How many litres of water are added ?

Easy

Solution

[H⁺] = 10^-2
$\large \frac{{{n_{{H^ + }}}}}{V} = {10^{ - 4}}$
$\large \Rightarrow \frac{{{{10}^{ - 2}} \times 1}}{V} = {10^{ - 4}}$
$\large \Rightarrow$ V = 100 L
water added = (100 - 1)L = 99L

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