Question

For a strong electrolyte, equivalent conductance increases slowly with dilution and can be expressed by the relationship : ${\Lambda }_m={\Lambda }_m^{\circ }-A\sqrt{c}$. Which electrolyte(s) have same value of A ?

• A. $NaCl$
• B. $CaC{l}_2$
• C. $ZnC{l}_2$
• D. $MgS{O}_4$

Answer 1

Answer: (B), (C)

$CaC{l}_2$
$ZnC{l}_2$

Effect of Concentration on Equivalent Conductance:
The variation of equivalent conductance or molar conductance with the concentration of the electrolyte is generally expressed graphically, as follows: It is a straight line with negative slope.

${\Lambda }_m={\Lambda }_m^{\circ }-A\sqrt{c}$

A depends on the type (magnitude of charge on cation and anion) of electrolyte for a given temperature of solvent.