Question

The equivalent conductance of $NaCl$ at concentration $C$ and at infinite dilution are ${\lambda }_c$ and ${\lambda }_{\infty }$ given as

• A. ${\lambda }_c={\lambda }_{\infty }+bC$
• B. ${\lambda }_c={\lambda }_{\infty }-bC$
• C. ${\lambda }_c={\lambda }_{\infty }-b\sqrt{C}$
• D. ${\lambda }_c={\lambda }_{\infty }+b\sqrt{C}$

Answer 1

Answer: (C)

Debye-Huckel Onsager equation can be written as
${\lambda }_c={\lambda }_{\infty }-b\sqrt{C}$
Where
${\lambda }_c$ = Molar conductivity of the solution at certain concentration
${\lambda }_{\infty }$ = Limiting molar conductivity
$C$ = Concentration
$b$ = Constant that depends on temperature, charges on the ions and dielectric constant as well as viscosity of the solution