What is the relationship between the equilibrium constant (K c ) of reaction and the rate constants for the forward (k) and reverse (k r ) reactions in a single step reaction

Respuesta :

Answer: The relationship between the equilibrium constant [tex](K_c)[/tex] of reaction and the rate constants for the forward [tex](k_f)[/tex] and reverse [tex](k_r)[/tex] reactions in a single step reaction is [tex]K_c=\frac{k_f}{k_b}[/tex]

Explanation:

Equilibrium constant is the ratio of product of the concentration of products to the product of concentration of reactants.

For example if the reaction is : [tex]X\rightleftharpoons Y[/tex]

[tex]K_c=\frac{[Y]}{[X]}[/tex]

Rate of forward direction=[tex]k_f[X][/tex]

Rate of backward direction=[tex]k_b[Y][/tex]

At equilibrium, Rate of forward direction = Rate of backward direction

thus [tex]\frac{k_f}{k_b}=\frac{Y}{X}[/tex]

where [tex]\frac{Y}{X}=K_c[/tex]

Thus [tex]\frac{k_f}{k_b}=K_c[/tex]