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.
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