Question

The standard emf of a cell, involving one electron charge is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is ______. (F = 96,500 C mol⁻¹)

Options

• 1.0 × 10¹

• 1.0 × 10⁵

• 1.0 × 10¹⁰

• 1.0 × 10³⁰

Answer 1

The standard emf of a cell, involving one electron charge is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is 1.0 × 10¹⁰.

Explanation:

\[\ce{E{^{\circ}_{cell}} = \frac{0.0591}{n} log_10 K_c}\]

∴ \[\ce{0.591 = \frac{0.0591}{1} log_10 K_c}\]

or, \[\ce{log_10 K_c = \frac{0.591}{0.0591}}\]

= 10.0

∴ K_c = 1.0 × 10¹⁰