The basic Salt sodium acetate CH3COONa is completely soluble

The basic Salt sodium acetate, CH3COONa, is completely soluble in water. What is the pOH of a 0.25 M solution of sodium acetate? (The Ka for acetic acid CH3COOH is 1.80x10^-5) .

Please show the equation for CH3COONa in water too!

Solution

for weak base

pKb=14-pKa=14-(-log(Ka))

pOH=0.5(pKb-logC)=0.5(9.2552-log(0.25))=4.9286

CH3COONa +H2O-----CH3COOH+NaOH