MHT CET202121 Sep 2021Morning ShiftChemistryChemical EquilibriumActual

Dissociation constant of propionic acid is 1.32 10⁻⁵ . Calculate the degree of dissociation of acid in 0.05 M solution.

Options

A2.6 10⁻⁴
B1.61 10⁻²
C1.90 10⁻²
D3.5 10⁻⁵

Correct answer

B. 1.61 10⁻²

Step-by-step solution

CH ₃ CH ₂ COOH (Propionic Acid) aligned & CH ₃ CH ₂ COOH _ ( aq ) CH ₃ CH ₂ COO _ ( aq ) ⁻+ H _ ( aq ) ⁺ & t =0₁ C & t = t _ aq , C - C C C & k _ a = c ^2 1- (1- 1) & aligned aligned & = k _ a C = 1.32 10⁻⁵ 0.05 = 132 10⁻¹ 5 10⁻² k _ a = c ^2 & = 2.64 10⁻²=1.61 10⁻² aligned

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