pH of mixture containing three moles of NH4OH and half mole of H2SO4 is pKb of NH4OH = 4.8
The mixture acts like a basic buffer;
NH4OH is a monoacidic base;
Number of gram equivalents = 3 x 1 = 3
H2SO4 is a dibasic acid;
Number of gram equivalents = 0.5 x 2 = 1
SA 1. g. eq. + WB1. g. eq.3 g. eq.2 g.eq.excess → Salt1 g. eq.+H2O
pOH=pkb+logVsNsVbNb pOH=4.8+log12 pOH=4.8-0.301 pH=14-4.5=9.5