200 g of 25% sulphuric acid solution was added to 300 g of 40% sulphuric acid solution. Find the concentration of the acid in the mixture.
Amount of acid in the 1st solution =0.25% of 200=50 g.
Amount of acid in the 2nd solution =0.4% of 300=120 g.
Total amount of acid =50+120=170 g.
Required concentration =170(200+300)×100=34%