Question

Consider the acid dissociation reactions and for the diprotic acid H2A:

H2A(aq) + H2O (l) --><-- HA-(aq) + H3O+(aq) pKa1= 3

H2A(aq) + H2O (l) --><-- A2- (aq) + H3O+(aq) pKa2= 8

Would a salt solution of KHA be acidic, basic or neutral?

a) Acidic

b) Basic

c) Neural

Answer 1

Consider the acid dissociation reactions and for the diprotic acid H2A: H2A(aq) + H20 (1) --><-- HA-(aq) + H3O+(aq) pka1= 3 H2A(aq) + H20 (1) --><-- A2- (aq) + H3O+(aq) pka2= 8 Would a salt solution of KHA be acidic, basic or neutral? a) Acidic b) Basic c) Neural Each dissociation has a unique Ka and pKa value. When the moles of base added equals half the total moles of acid, the weak acid and its conjugate base are in equal amounts. The ratio of CB / WA = 1 and according to the HH equation, pH = pka + log(1) or pH = pka HA PH = P ka + het НА“ H₂A H, А PH = pka of langer og det er en DH= P ka PH=3 PH = 3 & Pka = }} Acidic Solution Becausé PH value is less then 7 ANS → Acidic Thank you very much