Two weak bases AOH and BOH having equal concentrations of 0.5M are present in a solution. Calculate the ratio, [A+][B+] at equilibrium. Dissociation constants for AOH and BOH are 1.1×10−8 and 1.7×10−9 respectively.(Report the answer upto second decimal)
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Solution
For AOH :
AOH(aq)⇌OH−(aq)+A+(aq)
att=0C100
att=teqC1−C1α1(C1α1+C2α2)C1α1
For BOH :
BOH(aq)⇌OH−(aq)+B+(aq)
att=0C200
att=teqC2−C2α2(C1α1+C2α2)C2α2
Dissociation constant for AOH Kb1 : Kb1=(C1α1+C2α2)(C1α1)C1(1−α1) Dissociation constant for BOH Kb2 : Kb2=(C1α1+C2α2)(C2α2)C2(1−α2) Since α1andα2 are very small in comparison to unity for weak bases.So 1−α1≈1and1−α2≈1. Kb1=(C1α1+C2α2)(C1α1)C1(1−α1)