What is the pH of 2.5 × 10 -2 mol dm -3 barium hydroxide solution?
CHEMISTRY
POST UTME OAU
What is the pH of 2.5 × 10-2 mol dm-3 barium hydroxide solution?
- A) 11.5
- B) 11.6
- C) 11.7
- D) 11.8
Correct Answer: C) 11.7
Explanation
\(\underset{1\text{ mol dm}^{-3}}{\mathrm{Ba(OH)_2}} \longrightarrow \underset{2\text{ mol dm}^{-3}}{\mathrm{2OH}} + \underset{1\text{ mol dm}^{-3}}{\mathrm{Ba^+}}\) OH \(= 2(2.5 \times 10^{-3}) = 5.0 \times 10^{-3}\) POH of the solution \(= -\log 10 (\text{OH}^-) = -\log 10 (5.0 \times 10^{-3})\) \(\therefore\) POH \(= 2.3010\) PH + POH = 14 P = 14 - POH P = 14 - 2.3010 Answer \(= 11.7\)Post an Explanation Or Report an Error
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