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mol H2SO4=M x V(dlm L)
=0,1 x 0,075
=0,0075 mol
mol NaOH= M x V
=0,2 x 0,05
=0,01
perbandingan mol/koefisien H2SO4 dg NaOH
=0,0075/1 : 0,01/2
=0,0075 : 0,005
besar 0,0075 berarti mol yg tersisa= 0,0075-0,005
=0,0025mol
massa pereaksi yg tersisa
=mol r x Mr H2SO4
=0,0025 x (2+32+64)
=0,245 gram H2SO4