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What is the pH of a 0.01 M solution of nitric acid (HNO3), a strong monobasic acid?
A1
B12
C7
D2
Answer & Solution
Correct answer: D. 2
1. HNO3 is a strong monobasic acid, so it fully dissociates and [H+] equals 0.01 M.
2. Write 0.01 as 1 x 10 to the power minus 2.
3. pH = -log10[H+] = -log10(10^-2) = -(-2) = 2.
4. Therefore pH = 2; the value 1 would need [H+] = 0.1 M, which is ten times higher.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "pH Calculation", p.157_
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