Question

For a given reaction: $A^{(x+n)+}+n{e}^{-}\to A^{x+},$ the $E_{RP}^o$ is known along with concentration of $A^{(x+n)}$ and $A^{x+}$ ions. Select the correct statement.

• A. The value of n can be evaluated.
• B. The value of x can evaluated.
• C. The value of (x + n) can be evaluated.
• D. The value of n, x and (x + n) can be evaluated.

Answer 1

The correct option is A The value of n can be evaluated.

According to Nernst equation:

$E=E^o-\frac{0.0591}{n}logQ$

from the given reaction,

$E_{RP}=E_{RP}^o-\frac{0.059}{n}log\frac{\left[A^{x+}\right]}{\left[A^{(x+n{)}^{+}}\right]}$

$E_{RP}=E_{RP}^o+\frac{0.059}{n}log\frac{\left[A^{(x+n{)}^{+}}\right]}{\left[A^{x+}\right]}$

Value of n can be calculated by plotting this function as straight line and slope will give value of n.