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An acid H₂A has first and second dissociation constants of 1.0 × 10⁻⁵ and 5.0 × 10⁻¹⁰, respectively. What is the overall dissociation constant of this acid?
- 0.2 × 10⁵
- 5.0 × 10⁵
- 5.0 × 10¹⁵
- 5.0 × 10⁻¹⁵
Correct answer: 5.0 × 10⁻¹⁵
Solution
Overall dissociation constant = (1.0e-5)(5.0e-10) = 5.0e-15. The stored 0.2e5 is wrong.
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