Authors : S.R.Warhate
Page Nos : 182-188
Description :
As the cations and anions usually have different speed under the same potential gradient the quantity of
electricity carried by the cations in one direction will differ from that carried by anions in the other. The knowledge
of Transference number is quite important. To measure the transference number at higher temperature Hittrioff’s
apparatus is failed due to the possibility of inter mixing of the anode and cathode solution through diffusion and
convection is large. So W shaped apparatus is fabricated so that the transference number of Na2SO4 can be
measured even at higher temperature. The accuracy and the working of the W shaped apparatus is tested by
calculation of Transference number of Cu+2 .The most stuking observation in case of Na2SO4 is that as temperature
increases the transference number of Na+ increases what as that of SO4
-2 decreases. The observation is in
accordance with the known effect of temperature according to which the transference number of both cation and
anion tends to closer to 0.5 the ion for which it is less than 0.5 tends to increase and for the ion for which it is more
than 0.5 tends to decrease with temperature.
