So imma keeping posting memes to cover my depression
:p

the answer for sodium is 0.186

the answer for rubidium is 0.251

i think its 5049.

i hope this !

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