Question

Equilibrium constant for a reaction is 100. What will be the equilibrium constant for the reverse reaction?

Answer 1

The proportionality constant, which describes the relationship between the molar concentration of the reactants and the rate of a chemical reaction, is known as the rate constant. The rate constant, also known as the reaction rate constant or reaction rate coefficient, is denoted by the letter k.

Complete answer:
A chemical reaction's equilibrium constant is the value of its reaction quotient at chemical equilibrium, a condition reached by a dynamic chemical mechanism after a period of time has passed in which its structure shows no discernible propensity to alter. The equilibrium constant is independent of the original analytical concentrations of the reactant and component species in the mixture for a given range of reaction conditions. As a result, known equilibrium constant values can be used to determine the composition of a system at equilibrium, provided its initial composition.
Given that
For a given forward reaction
${K_c}(f) = 100$
Now let the equation be
$A \rightleftharpoons B$
${K_c}(f) = \dfrac{{[B]}}{{[A]}} = 100$
For a given backward reaction
${K_c}(b) = ?$
Now let the equation be
$B \rightleftharpoons A$
${K_c}(b) = \dfrac{{[A]}}{{[B]}} = \dfrac{1}{{100}}$
${K_c}(b) = 0.01$
Equilibrium constant for backward reaction is 0.01
The equilibrium constant ( K ), a unitless number, is the ratio of the rate constants for forward and reverse reactions at equilibrium. The magnitudes of the forward and reverse rate constants at equilibrium decide the composition of the equilibrium mixture. A reaction's K will still be the same under the same set of conditions. The law of mass action applies K to the ratio of equilibrium component concentrations to reactant concentrations increased to their respective forces to satisfy the coefficients in the equilibrium equation for a system at equilibrium. The equilibrium constant expression is the name given to the ratio.

Note:
The proportionality constant, which describes the relationship between the molar concentration of the reactants and the rate of a chemical reaction, is known as the rate constant. The rate constant, also known as the reaction rate constant or reaction rate coefficient, is denoted by the letter k.