Question

200g solutie Nacl 15% se amesteca cu 300g solutie KCL 20%. Concentratia fiecarei substante în noua soluție formata este : ... % Nacl, ... %KCL?

Answer 1

ms1=200g NaCl
Cp1=15%
ms2=300g KCl
Cp2=20%
Cp1=md1/ms1*100 =>md1=Cp1*ms1/100=15*200/100=30g
Cp2=md2/ms2*100 =>md2=Cp2*ms2/100=20*300/100=60 g
mdf=md1+md2=30+60=90g
msf=ms1+ms2=200+300=500g
Cpf=mdf/msf*100=90/500*100=18%
500g........18%
200g.....300g....x....y
x=200*18/100=7.2% Na Cl
y=300*18/500=10.8% KCl