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diket:
M1 = 0,1M ...v1 = 40 mL
M2 = 0,05M ...v2 = 60mL
M3 = 0,05M ..v3???
maka
M1V1 + M2V2 = M3V3
0,1 . 40 + 0,05.60 = 0,05V3
4 + 3 = 0,05M3
M3 = 7/0,05 = 140mL