32.65 mL of 0.300 M NaOH are required to titrate H3PO4 to the equivalence point. How many moles of H3PO4 are needed to reach the equivalence point ?

it's all four options.

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

you need to stop taking that class