MHT CET202313 May 2023Evening ShiftChemistryElectrochemistryActual
What is the molar concentration of acetic acid if value of its dissociation constant is 1.8 10⁻⁵ and degree of dissociation is 0.02 ?
Options
- A4.6 10⁻³ M
- B4.5 10⁻² M
- C4.0 10⁻⁴ M
- D3.6 10⁻² M
Correct answer
B. 4.5 10⁻² M
Step-by-step solution
K _ a =1.8 10⁻⁵ ; =0.02 For a weak monobasic acid, K _ a = ^2 c c= K _ a ^2 = 1.8 10⁻⁵ 0.02^2 =0.045 M =4.5 10⁻² M