Question

din 100 g solutie de concentratie 5% sau evaporat 20 g apa Determina concentratia solutiei finale obinute

Answer 1

ms1=100g cu c1%=5
mapaevaporata=20g
md=c•ms/100
=5•100/10"
=5
ms1=mapa+md=>mapa=ms1-md=>mapa=100-5=95
maparamasa=mapa-mapaevaporata=>maparamasa=95-20=75
msfinal=75+5=80
cfinal=md•100/ms=>cfi al=5•100/80=50/8=6,25%