A container containing 5.00L of a gas is collected at 246 K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure?
Assume moles and pressure are constant

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