Calculate the degree of ionisation and ph of 0 05 M solution of a weak base having the ionization constant - Chemistry - Equilibrium

Question

Calculate the degree of ionisation and ph of 0 05 M solution of a
weak base having the ionization constant (Kb) is1 77 ? 10 raised to
power -5 Also calculate the ionisation constant of the conjugate
acid of this base

Vartika Jain · Accepted Answer

Dear Student,

Now, we know thatKa×Kb=Kw=10-14Therefore, Ka =KwKb=10-141
77×10-5=0
564×10-9Now, Ka=Cα2or, α=KaC=0
564×10-90 05=10 92×10-9=1
044×10-4Now, B(aq) + H2O(aq) → BH+(aq) + OH-(aq)          0
05M                            0                  0         0
05-α                        +α               +αTherfore,[OH-]=1
044×10-4pOH=-log[OH-] =-log(1 044×10-4) =-0
0187+4=3 981So, pH= 14-pOH= 14-3 981=10 01

Calculate the degree of ionisation and ph of 0.05 M solution of a weak base having the ionization constant (Kb) is1.77 ? 10 raised to power -5 .Also calculate the ionisation constant of the conjugate acid of this base