First slide

PH of strong acids and strong bases

Question

The pH of HCl is 5. It is diluted by 1000 times. Its pH will be

Moderate

A

5
B

8
C

2
D

6-7

Solution

[H⁺] = 10^-5
After dilution by 1000 times, [H⁺] = 10^-8
When the concentration of H⁺ ion coming from acid is less than equal to 10^-7 M, then the H⁺ ion furnished from water is also taken into account.
$[H^{+}] = 10^{- 8} (from acid) + 10^{- 7} (from water); [H^{+}] = 1.1 \times 10^{- 7}; p^{H} = 6.956;$

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