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Question
Choose the most correct answer:
The pH of 10-8 M of HCl is ______.
Options
8
7
less than 7
greater than 7
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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