JAMB Chemistry 2008 Objective — Question 18

Question 18 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

What is the pH of a 0.001 mol dm3 solution of sodium hydroxide?

A. 14
B. 13
C. 12
D. 11Correct

Explanation

Concentration of NaOH = 0.001moldm-3. NaOH -> Na+ + OH-. 0.001M each. pOH = -log10[OH-] = -log10[0.001] = 3. pH+pOH=14. pH=14-3=11.

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