MHT CET 2024 Chemistry question

Calculate the concentration of weak monobasic acid If its degree of dissociation and dissociation constant are and respectively

(A)0.01 M
(B)0.02 MCorrect
(C)0.03 M
(D)0.04 M

Answer: (B)

Solution

For a weak monobasic acid HA of concentration and degree of dissociation , Ostwald's dilution law gives . Therefore \dfrac{K_a}{α^{2}}\dfrac{5.0×10^{-9}}{(5.0×10^{-4})^{2}}\dfrac{5.0×10^{-9}}{25×10^{-8}}$ =

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Question ID VK-093396