Help Pls! 1- MgO = _ atoms
2- Rb2S = _ atoms
3- Ca(OH)2 = _ atoms
4- K2SO4 = _ atoms
5- Ga2(CO3)2 = _ atoms

idk what is it? is this a question that you know the answer or u dont

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 your looking for is c).