Question

For given half cell; $A{l}^{3+}+3e^{-}\to Al$: on increasing $\left[A{l}^{3+}\right]$, the electrode potential

• A. Increases
• B. Decreases
• C. No change
• D. First increases then decreases

Answer 1

The correct option is A

Increases

Remember: $E=E^{\circ }-\frac{RT}{nF}lnQ$

$E=E^{\circ }+\frac{0.059}{3}log\frac{\left[A{l}^{3+}\right]}{Al}$
So, If $\left[A{l}^{3+}\right]\uparrow \Rightarrow E\uparrow$