Question

se amesteca doua kg solutie sare 35% cu 5 kg solutie sare 15% si trei kg apa. Sa se afle concentratia solutiei obtinute

Answer 1

ms1=2 kg
c1=35%
ms2=5 kg
c2=15%
mH2O=3 kg

c=(md/ms)*100

md1=(c1*ms1)/100=(35*2)/100=70/100=0,7 kg
md2=(c2*ms2)/100=(15*5)/100=75/100=0,75 kg

md(final)=md1+md2=0,7+0,75=1,45 kg
ms(final)=ms1+ms2+mH2O=2+5+3=10 kg

c(final)=(1,45/10)*100=14,5%