What effect does a catalyst have on a system in equilibrium

There is no effect of catalyst on a system in equilibrium.

Explanation: A equilibrium reaction is one in which rate of forward reaction is equal to the rate of backward reaction.

Addition of a catalyst to a equilibrium reaction affects the forward and backward reactions equally and thus do not affect the equilibrium.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l