Question

Select the correct statement for $\Lambda_{ m }=\Lambda_{ m }^{\circ}-A C^{1 / 2}$.

• A. This equation is for weak electrolyte
• B. Intercept is equal to $\Lambda_{ m }$
• C. Slope is ' $A$ '
• D. Value of $A$ depends on the charges of cation and anion

Answer 1

Answer: (D)

For strong electrolytes $\Lambda_{ m }=\Lambda_{ m }^{\circ}-A C^{1 / 2}$
If we plot $\Lambda_{ m }$ against $C^{1 / 2}$, we obtain straight line with intercept equal to $\Lambda_{m}^{\circ}$ and slope is equal to $-A$. The constant $A$ depends on the type of electrolyte, i.e. charges on cation and anion produced on dissociation of electrolyte.