The are used to change the vapor to a liquid and the liquid form back into a vapor the refrigeration cycle. A. condenser and compressor B. compressor and expansion device C. expansion device and evaporator D. condenser and evaporator

the answer is a and have a great day

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