At infinite dilution, when the dissociation of electrolyte is complete, each ion makes a definite
Channel: Doubtnut
Date: 2020-03-29

At infinite dilution, when the dissociation of electrolyte is complete, each ion makes a definite contribution towards the molar conductance of electrolyte, irrespective of the nature of the other ion with which it is associated. the molar conductance of an electrolyte at infinite dilution can be expressed as the sum of the contributions from its individual ions. `A_(x)B_(y) rarr xA^(y+)+yB^(x-)` `Lambda_(m)^(@)(A_(x)B_(y))=xlambda_(A^(y+))^(@)+ylambda_(B^(x-))^(@)` where, x and y are the number of cations and anions respectively. The degree of ionisation `\'alpha\'` of weak electrolyte can be calculated as : `alpha=Lambda_(m)/Lambda_(m)^(@)` The molar conductances at infinite dilution for electrolytes BA and CA are 140 and 120 `ohm^(-1) cm^(2) mol^(-1)`. If the molar conductance at infinite dilute dilution of BX is 198 `ohm^(-1) cm^(2) mol^(-1)`, then at infinite dilution, the molar conductance of CX is :