Ionic EquilibriumHard
Question
Approximate pH of 0.1 M aqueous H2S solution when K1 and K2 for H2S at 25oC are 1 × 10-7 and 1.3 × 10-13 respectively :
Options
A.4
B.5
C.6
D.8
Solution
pH of 0.1 M H2S solution can be derived by :
H2S ⇋ H+ + HS- ; K1 = 1 × 10-7
∴ [H+] = Cα = C
= 10-4
∴ pH = 4
H2S ⇋ H+ + HS- ; K1 = 1 × 10-7
∴ [H+] = Cα = C
= 10-4∴ pH = 4
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