For a weak acid HA , the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol L − 1 , then the correct option for its K a at the same temperature isNEET 20

Question

For a weak acid HA , the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol L − 1 , then the correct option for its K a ​ at the same temperature isNEET 2023 (Manipur)

TestHub · Accepted Answer

​ HA ⇌ H + + A − At t = 0 C − At eq. C − C α C α C α K = [ HA ] [ H + ] [ A − ] ​ = C ( 1 − α ) ( C α ) ( C α ) ​ = 1 − α C α 2 ​ = C 2 ( ∵ α is very small ) = 0.1 ( 0.01 ) 2 = 1 × 1 0 − 5 ​

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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