First slide

PH of strong acids and strong bases

Question

The pH of 10^–8 M aqueous HCl is

Easy

A

8
B

6
C

7
D

6.98

Solution

When the concentration of the acid or base is less than equal to 10^-7 M, then the [H⁺] or [OH^-] coming from water is also taken into account to determine the P^H of the solution.
$[H^{+}] = 10^{- 8} M (from HCl) + 10^{- 7} M (from water) [H^{+}] = 1.1 \times 10^{- 7} M;$
p^H = 7 – log1.1 = 6.98 ;

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