MCQ
A 0.2 molar solution of formic acid is 3.2% ionised. Its ionisation constant is:
- A9.6 × 10-3
- B2.1 × 10-4
- C1.25 × 10-6
- D4.8 × 10-5
✓
Answer
- 2.1 × 10-4
Explanation:
$\text{K}=\text{C}\alpha^2=0.2\times(0.032)^2$
$=2.1\times10^{-4}$
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