vikas askiitian expert
Last Activity: 14 Years ago
alfa(degree of dissotion) = (Kb/c)
1% means alfa = 0.01 , c = 0.1 so
Kb = 10-5 .......................1(Kb is constant )
Kb = [B+][0H-]/[BOH]
finally 0.2mol of BCl is added so
B+ from BCl is added in the solution & here common ion effect is produced ...
now , Kb = [BCl][OH-]/[BOH]
OH- = C(alfa) (alfa is final degree of dissociation)
BOH = C
kb = [BCl]alfa
10-5 = 0.2(alfa)
alfa = 5 * 10-5
option b) is correct
approve my ans if u like