Question
The dissociation constant of weak acid HA is 1.5 10^ -5 . Find the percent dissociation, containing 0.2 moles per 2 liters of solution.
MHT CET
Chemistry
Ionic Equilibrium
2026
MHT CET 2026 (15 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 1.22\%
- B. 1.18\%
- C. 1.14\%
- D. 1.26\%
Answer
A. 1.22\%
Step-by-step solution
Concentration of the weak acid C = 0.2 2 = 0.1 M Dissociation constant K_a = 1.5 10^ -5 For a weak acid, K_a = C ^2 (assuming 1) = K_a C = 1.5 10^ -5 0.1 = 1.5 10^ -4 = 1.224 10^ -2 Percent dissociation = 100 = 1.224 10^ -2 100 = 1.22\% Answer: 1.22\%
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