Chemical EquilibriumHard
Question
The first and second dissociation constants of an acid H2A are 1.0 × 10-5 and 5.0 × 10-10 respectively.
The overall dissociation constant of the acid will be
The overall dissociation constant of the acid will be
Options
A.5.0 × 10-5
B.5.0 × 1015
C.5.0 × 10-15
D.0.0 × 105
Solution
H2A ⇋ HA- + H+ K1 = 
.....(1)
HA- ⇋ H+ + A2- K2 =
.....(2)
For the reaction
H2A ⇋ 2H+ + A2-
K =
= K1 × K2
= 1 × 10-5 × 5 × 10-10
= 5 × 10-5
Hence, (3) is correct.
.....(1)HA- ⇋ H+ + A2- K2 =
.....(2) For the reaction
H2A ⇋ 2H+ + A2-
K =
= K1 × K2 = 1 × 10-5 × 5 × 10-10
= 5 × 10-5
Hence, (3) is correct.
Create a free account to view solution
View Solution FreeMore Chemical Equilibrium Questions
For the reaction $$\text{CO}(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}_2(g) + \text{H}_2(g)$$ at a given t...Which one of the following statements is not correct?...The equilibrium constant Kp1 and Kp2 for the reactions A ⇋ 2B and P ⇋ Q + R, respectively, are in the ratio ...For the reaction: $$\text{PCl}_5(g) \rightleftharpoons \text{PCl}_3(g) + \text{Cl}_2(g)$$ which of the following conditi...For the equilibrium CuSO4.5H2O(s) ⇋ CuSO4.3H2O(s) + 2H2O(g) Kp = 2.25 × 10-4 atm2 and vapour pressure of wate...