Question

calculati concentratia procentuala a solutie obtinute prin amestecarea a 200 g solutie de saramura de concentratie 10 la suta cu 50 g solutie saramura de concentratie 20 la suta.urgentttttttttttt

Answer 1

ms=masa solutiei
md=masa dizolvatului
mapa=masa apei
c=concentratia procentuala
msf=masa solutiei finala
mdf=masa dizolvatului finala
mapaf=masa apei finala
cf=concentratia procentuala finala

10/100=md1/200g =>md1= 10x200g/100=> md1=2000g/100=>md1=20g/10=>md1=20g

20/100=md2/50g=>md2=20x50g/100=>md2=1000g/100=>md2=10g/1=>md2=10g

c/100=md/ms
ms=md+m apa

mapa1=ms1-md1=>mapa1=200g-20g=>mapa1=180g

mapa2=ms2-md2=>mapa2=50g-10g=>mapa2=40g

msf=ms1+ms2=>msf=200g+50g=>msf=250g
mdf=md1+md2=>mdf=20g+10g=>mdf=30g
mapaf=mapa1+mapa2=>mapaf=180g+40g=>mapaf=220g

cf/100=mdf/msf=>cf/100=30g/250g=>cf=30gx100/250g=>cf=3000g/250g=>cf=300g/25g=>cf=12%