Question

Calculati masa apei care trebuie evaporata din 700 grame concentratia solutiei =15% pentru a obtine o solutie de Concentratie 50 %

Answer 1

C=md/ms*100=>md=C*ms/100=15*700/100=105g

ms=md+mH2O=>mH2O=595g

C*mH2O=md(100-C) => mH2O=md(100-C)/C = 105(100-50)/50 = 105g

mH2O evaporată = 595-105=490g

Answer 2

ms1=700 g
c1=15%
c2=50%
mapa evap =?

md=ms1*C1/100=700g*15/100=105 g
ms2=md*100/c2=105g*100/50=210 g
m apa evap=ms1-ms2=700 g-210 g=490 g