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Question
Calculate the pH of 0.04 M HNO3 solution.
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Solution
Concentration of HNO3 = 0.04 M
[H3O+] = 0.04 mol dm−3
pH = –log [H3O+]
= –log (0.04)
= –log (4 × 10−2)
= 2 – log4
= 2 – 0.6021
= 1.3979
= 1.40
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