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Question
The pH of 10−8 M of HCl is ______.
Options
8
7
less than 7
greater than 7
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Solution
The pH of 10−8 M of HCl is less than 7.
Explanation:
When the concentrations of H+ from acid and water are comparable, the concentration of H+ from water cannot be ignored in an extremely diluted acidic solution.
[H+] = 10−8 + 10−7
= 10−8 (1 + 10)
= 11 × 10−8
= −log (11 × 10−8)
= 8 − log 11
= 8 − 1.04
= 6.96
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