Question

AJUTOR,E URGENT,DAU COROANA!!!
Determinati concentratia procentuala a unei solutii obtinute prin amestecarea a 75g solutie de concentratie 15% cu 60 g solutie de concentratie 20% si cu 124g solutie de concentratie 14%.

Answer 1

c = md*100/ms
md1 = 75*15/100 = 11,25 g dizolvat
md2 = 60*20/100 = 12 g dizolvat
md3 = 124*14/100 = 17,36 g dizolvat
md4 = md1+md2+md3 = 40,61 g dizolvat
ms4 = ms1+ms2+ms3 = 259 g soluție
c4 = 40,61*100/259 = 15,67%

Answer 2

c1=15%, ms1=75g
c2=20%, ms2=60g
c3=14%, ms3=124g

c1=md1/ms1*100, md1=c1*ms1/100=15*75/100=11,25g
c2=md2/ms2*100, md2=c2*ms2/100=20*60/100=12g
c3=md3/ms3*100, md3=c3*ms3/100=14*124/100=17,36g
mdf=md1+md2+md3=11.25+12+17.36=40,61g
msf=ms1+ms2+ms3=75+60+124=259g
cf=mdf*100/msf=40.61*100/259=15.685