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Mistura água, etanol e 
hexano 
EEllaabboorraaddoo ppoorr:: 
Elvis nº7 
Humberto nº9 
Joana nº11 
João Guilherme nº13
Mistura: água; etanol e hexano 
• Esta mistura é heterogénia porque o hexano é um líquido imiscivel (é 
insoluvel), logo podemos verificar 2 fases. 
hexano 
Água e 
etanol
1º - separação do hexano da água e do 
etanol: 
• Para separar o hexano da água e do etanol utilizamos a técnica da 
ddeeccaannttaaççããoo, e para tal utilizamos os seguintes materiais: 
ü üSuporte (garra); 
üAmpola de decantação; 
üGobelé. 
• 
suporte Ampola de 
decantação 
hexano 
Água e 
etanol 
gobelé
Decantação 
1. Colocamos a mistura (água, etanol e hexano) numa ampola de 
decantação. 
2. Como o hexano é imiscivel conseguimos fazer com que fique só o hexano 
na ampola de decantação, para tal abrimos a torneira e deixamos 
escorrer a água e o etanol para dentro do gebelé. 
Água e etanol
2º - separação do etanol da água: 
• 
• 
•• Para separar a água do etanol (mistura homogénia) utilizamos a técnica da 
ddeessttiillaaççããoo ffrraacciioonnaaddaa, e para tal utilizamos os seguintes materiais: 
üSuporte universal; 
üFonte de energia; 
üBalão; 
üColuna de fracionamento; 
üCondensador; 
üCabeça de destilação; 
üTermómetro; 
üMatraz. 
ü 
ü 
ü 
ü
Destilação fracionada 
1. Colocamos a mistura (água e etanol) no balão de decantação. 
2. Ligamos a fonte de energia para aquecer a mistura, como o etanol tem o 
ponto de ebuliçao mais baixo evapora mais rapidamente que a água 
podendo passar por toda a coluna de fracionamento enquanto que a 
água não consegue evaporar pois o seu ponto de ebulição é de 100ºC. 
3. Seguidamente o etanol evaporado passa pelo condensador ficando 
novamente em estado líquido (condensação) devido à circulção de 
água no exterior do tubo. 
4. Depois de o etanol estar em estado líquido sai do condensador e cai para 
dentro do matraz.
Demonstração

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Mistura água, etanol e hexano

  • 1. Mistura água, etanol e hexano EEllaabboorraaddoo ppoorr:: Elvis nº7 Humberto nº9 Joana nº11 João Guilherme nº13
  • 2. Mistura: água; etanol e hexano • Esta mistura é heterogénia porque o hexano é um líquido imiscivel (é insoluvel), logo podemos verificar 2 fases. hexano Água e etanol
  • 3. 1º - separação do hexano da água e do etanol: • Para separar o hexano da água e do etanol utilizamos a técnica da ddeeccaannttaaççããoo, e para tal utilizamos os seguintes materiais: ü üSuporte (garra); üAmpola de decantação; üGobelé. • suporte Ampola de decantação hexano Água e etanol gobelé
  • 4. Decantação 1. Colocamos a mistura (água, etanol e hexano) numa ampola de decantação. 2. Como o hexano é imiscivel conseguimos fazer com que fique só o hexano na ampola de decantação, para tal abrimos a torneira e deixamos escorrer a água e o etanol para dentro do gebelé. Água e etanol
  • 5. 2º - separação do etanol da água: • • •• Para separar a água do etanol (mistura homogénia) utilizamos a técnica da ddeessttiillaaççããoo ffrraacciioonnaaddaa, e para tal utilizamos os seguintes materiais: üSuporte universal; üFonte de energia; üBalão; üColuna de fracionamento; üCondensador; üCabeça de destilação; üTermómetro; üMatraz. ü ü ü ü
  • 6. Destilação fracionada 1. Colocamos a mistura (água e etanol) no balão de decantação. 2. Ligamos a fonte de energia para aquecer a mistura, como o etanol tem o ponto de ebuliçao mais baixo evapora mais rapidamente que a água podendo passar por toda a coluna de fracionamento enquanto que a água não consegue evaporar pois o seu ponto de ebulição é de 100ºC. 3. Seguidamente o etanol evaporado passa pelo condensador ficando novamente em estado líquido (condensação) devido à circulção de água no exterior do tubo. 4. Depois de o etanol estar em estado líquido sai do condensador e cai para dentro do matraz.