Calculate dissociation constant for an acid textHA having [.H+]. equals to text0 text.1 textM (Given: degree of dissociation of textHA is text1 % )

Question

Calculate dissociation constant for an acid textHA having [.H+]. equals to text0 text.1 textM (Given: degree of dissociation of textHA is text1 % ) (A)  text1 text0 text-8 (B)  text1 text0 text-6 (C)  text1 text0 text-3 (D)  text1 text0 text-7

Tardigrade Admin · Accepted Answer

ka=(α 2 C/1 - α ) , α is very small ; ∴ 1-α ≈ 1 textCÎ± text= text0 text.1 ka text= text(CÎ±)Î± = 0.01 × 0.1 = 10- 3

Q. Calculate dissociation constant for an acid $HA$ having $[H^{+}]$ equals to $0 .1 M$ (Given: degree of dissociation of $HA$ is $1%$ )

$1 0^{-8}$

$1 0^{-6}$

$1 0^{-3}$

$1 0^{-7}$

$k_{a} = \frac{α ^{2} C}{1 - α}$ , $α$ is very small ;

$∴ 1 - α \approx 1$

$Cα = 0 .1$

$k_{a} = (Cα)α$

$= 0.01 \times 0.1 = 1 0^{- 3}$

Q. Calculate dissociation constant for an acid HA having [H+] equals to 0.1M (Given: degree of dissociation of HA is 1% )

10-8

10-6

10-3

10-7