Question

Calculeaza masa NaCl care poate fi adaugata la 300 grame solutia de 5% pentru a obtine o solutie de 11%

Answer 1

C=md/ms*100 => md=C*ms/100 = 5*300/100 = 15g

ms=md+mH2O => mH2O = ms-md = 300-15 = 285g

C*mH2O=md(100-C) => md=C*mH2O/100-C = (11*285)/(100-11) = 35,2247g NaCl

md adaugat = 35,2247-15 = 20,2247g NaCl