Answer to Question #103252 in General Chemistry for Shubham kumar jha

Question

For the hydrolysis of a salt of a weak acid and a weak base, show that
K h = K w/K a K b

Answer 1

hydrolysis of NH4HS salt (ammonium hydrosulfide) - a salt of a weak acid and a weak base

NH₄⁺ + HS^– + НОН ⇆ NH₄ОН + H₂S

Ка(H₂S)=1.02*10^-7

Кb(NH₄ОН )=1.76*10^-5

For a salt of a weak monoacid base and a weak monobasic acid:

Кг=Кw / (Ка ∙ Кb) = 10^-14 / (1.02*10^-7 *1.76*10^-5) = 5.570*10^-3