Question

$Mg(s)|M{g}^{2+}(aq)||Z{n}^{2+}(aq)|Zn(s);E^{\circ }=+3.13\text{V}$

The correct plot of $E_{cell}$ versus $log\frac{[M{g}^{2+}]}{[Z{n}^{2+}]}$ will be represented as

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

For the given cell,

$\text{E}\text{=}{\text{E}}^{\text{o}}-\frac{\text{0}\text{.059}}{\text{2}}{\text{log}}_{\text{10}}\frac{\left[{\text{Mg}}^{\text{2+}}\right]}{\left[{\text{Zn}}^{\text{2+}}\right]}$

This equation is of the form $\text{y}\text{=}\text{mx}\text{+}\text{c,}$ its slope is negative and intercept equal to ${\text{E}}^{\text{o}}$

$Slope=-\frac{0.059}{2}$

Intercept $\text{=}{\text{E}}^{\text{o}}$ .