Question

Se amesteca 400g sol. 40% zahar cu 400g sol. 10% zahar si 200g H2O.Calculati:
a) Masa de zahar din solutia finala;
b) Concentratia procentuala a solutiei finale;
c) Masa de zahar ce trebuie adaugat,pentru a creste concentratia la 30%

Answer 1

ms1=400g
cp1=40%
ms2=400g
cp2=10%
mh2o=200g
cp1=md1/ms1*100 => md1=Cp1*ms1/100=40*400/100 = 160g
Cp2=md2/ms2*100 => md2 = cp2*ms2/100=10*400/100 = 40 g
a)mdf=md1+md2=160+40=200g zahar
msf=md1+md2+mh2o=200+200=400g
b)Cpf=mdf/msf*100=200/400*100= 50%
c) md3=md1-md2=160-40=120g zahar necesar pentru a creste solutia cu 30%
Cp=md3/msf*100 => md3 = Cp*msf/100 = 30*400/100 = 120 g zahăr