Answer in General Chemistry for AKSHAT #156478
In the determination of transference numbers of HCl by moving boundary method a 0.10 M
solution of HCl was taken in a cell having uniform area of cross section of 1.6 cm2. At the end of
experiment the boundary moved by 11.7 cm and 0.22 g of silver was deposited on the cathode of
silver coulometer. Calculate the transference numbers of ions of HCl.
Transport number of H+ ions = l x a x c / 1000Q (moving boundary method)
l is length of migration = 11.7 cm
a is area of cross-section =1.6 cm2
c is concentration of solution =0.10 M
Q is charge passed = Equivalent of Ag deposited Q = W/E = 0.22 /108 Faraday
∴tH+ = (11.7 x 1.6 x 0.1 x 108) / (0.22 x 1000) = 0.92
Transport number of H+ ions is 0.92
tH+ + tCl− = 1
tCl− = 1− 0.92 = 0.08
Transport number of Cl− ions is 0.08.