calculate the amount of solvent that separates as solid when 30gram of saturated solution prepared at 50 degree Celsius is cooled 30 degree Celsius the solubility of the given solute is 35at 50 degree Celsius and 21 at 30degree Celsius​

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

the answer is 0.42 is that is an option. this question provides no info