Question

Se amesteca 200g solutie de zahar de contractie 20% cu 300g solutie de zahar de concentratie 30%.
Calculati concentratia procentuala a solutiei.

Answer 1

c1=md supra ms ×100
md=c×ms supra 100
md=20×200 supra 100
md=40g
c2=md2 supra ms2 ×100
md2=c2×ms2 supra 100
md2=30×300 supra 100
md2=90g
cf=mdf supra msf ×100
mdf=md1+md2=40+90=130g
msf=ms1+ms2=200+300=500g
cf=mdf supra msf×100
cf=130 supra 500 ×100=26%