Which of the following describes freezing? A substance changing from the liquid to the gaseous state.
A substance changing from the gaseous state to the liquid state.
A substance changing from the liquid state to the solid state.
A substance changing from the solid state to the liquid state.

C. a substance changing from the liquid state to the solid state.

Explanation:

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