Question

Se amesteca o solutie cu masa de 400g de concentratie 14% cu 150g solutie de concentratie 8%. Aflati concentratie solutiei finale.

Answer 1

Mai multe moduri de rezolvare.
ms1=400g
ms2=150 g
ms final=400+150=550g
c=md*100/ms, md=c*ms/100
md1=c1*ms1/100=14*400/100=56g
md2=...=150*8/100=12g
md final=56+12=58g
c finala=mdf*100/msf=58*100/550=10,545%

Answer 2

Masa totala = 400 + 150 = 550g

Masa dizolvata 1 = 14 % * 400 = 56g
Masa dizolvata 2 =  8 % * 150  = 12g
56g + 12g = 68g

68 g de maasa dizolvata in 550 solutie reprezinta procentul:  68 / 550 * 100 = 12,36%