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Molaritas H+ dari HNO3= 1 . 0,25= 0,25M
Molaritas H+ dari H2SO4= 2. 0,25= 0,5M
M1.V1+M2.V2=M3.V3
0,25.200 + 0,5.300 = M3 . 500
50 + 150 = M3.500
200/500 = M3
M3= 0,4 (C)