When 100 g of 20°C water is mixed with 50 g of 50°C water in a closed system, what is the final water temperature?

A 20°C

B) 30°C

C) 35°C

D50°C

it is a solid

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