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.