Question

calculate the PH of a solution in which the concentration of hydrogen ions is 1.0 x 10 ^-8 mol litre ^-1.

Answer 1

Answer:

The pH of a solution with the [H + ] = 1 × 10 -2 M is 2 and the pH of a solution with the [H + ] = 1 × 10 -10 M is 10.

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Answer 2

Solution :

Here, although the solution is extremely dilute, the concentration given is not of an acid or a base but that of $H^+$ ions. Hence, the pH can be calculated from the relation :

$\text{pH} = - \log_ {10}[H^+]$

given, $[H^+] = 1.0 \times 10^{-8} \text{mol litre}^{-1}$

$\text{pH} = - \log_{10}10^{-8}$

$\implies -(-8 \times \log_{10}10)$

$\implies -(-8 \times 1) \implies -(-8)$

$\boxed {\text{pH = } 8}$