Question

ce masa de apa trebuie evaporata din 180 g solutie, de concentratie 10%, astfel incat concentratia sa se tripleze?

Answer 1

c1=10%=>c2=30%
md1 = ms1*c1/100 = 180*10/100 = 18 g
md1 = md2
=> ms2 = md2/c2 * 100 = 18/30 * 100 = 60 g
ms2 = ms1 - m apa => m apa = 180-60=120 g apa