A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH pK a )?

Question

A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH pK a ​ )?

TestHub · Accepted Answer

​ K a ​ = C ( 1 − x ) [ H + ] ( x ) ​ [ H + ] = K a ​ x ( 1 − x ) ​ lo g H + = lo g K a ​ + lo g ( x 1 − x ​ ) − lo g H + = − lo g K a ​ − lo g x 1 − x ​ pH = pK a ​ − lo g x 1 − x ​ pH − pK a ​ = lo g 1 − x x ​ ​

Chemistry - Ionic Equilibrium Question with Solution | TestHub

Options:

Doubts & Discussion