Question

Ce cantitate de alcool trebuie adaugata la 50g solutie de alcool de concentratie 25% pentru a ajunge ajunge la o concentratie de 40% alcool?

Answer 1

ms1=50g

c1=25%

c2=40%

________

md ad.=?

________

md1=ms1 x c / 100

md1=50 x 25 /100=12,5

md1=md2

ms2=md2 x 100 /c2

ms2=12,5 x 100 /40=31,25

ms ad.=50+31,25=81,25

c ad.=25+40=65

md ad.=ms ad x c ad / 100

md ad.=81,25 x 65 /100=52,8125