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Her Time

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Submitted By malle1404
Words 384
Pages 2
Fedt I chips

Formål:
At bestemme fedtindholdet i chips målt som masse % (100%*g fedt/g chips)

Teori:
Da både fedt og rensebenzin er polære, kan de blande sig med hinanden. Fedtet i chipsene bliver trukket ud af rensebenzinen. Når vi varmer det på pladen, bliver rensebenzinen til en gas form, hvorimod olien forbliver.

Materialer:
Fælles:
Vægt, mortor, varmeplade

Hvert hold:
50 ml måleglas
2x250 ml bægerglas
250 ml konisk kolbe
Glastragt
Glasuld
Gummihandsker
Glasspatel
Alufolie
Kemikalier
Rensebenzin
Chips
Metoder:
1. Chips knuses i morter. Holdet skal bruge 10 g. 2. Ca. 10 g knust chips afvejes nøjagtigt i det ene måleglas idet vægten noteres i skemaet.
Ekstraktion:
3. I stinkskabet hældes 50 ml rensebenzin op i måleglasset. Luk måleglasset med alufolie, og tag det med til holdets plads. 4. Hæld rensebenzin over i måleglasset med knuste chips under punktudsug, og rør forsigtigt rundt med spatel. 5. Kom lidt glasuld i glatraget (grub gummihandsker) og sæt den i den koniske kolbe. Filtrer blandingen gennem glasulden ned i den koniske kolbe, idet så meget som muligt at chips-massen holdes tilbage i bægerglasset. Tryk chips-massen lidt med spatlen for at få så meget som muligt ud af blandingen overført i kolben. 6. Gentag ekstraktion og filtrering med 40 ml rensebenzin. Genbrug glastragt med glasuld. 7. Vej det andet rene bægerglas, og noter vægten i skemaet. Mærk det med hold nr. 8. Overfør blandingen fra den koniske kolbe til det netop vejede bægerglas. 9. Sæt bægerglasset på varmepladen under udsuget. Det skal være plads til 2 holds glas på en plade. Ud vis forsigtighed og pas på i ikke brænder jer på pladen. 10. Opløsningen inddampes på varmepladen indtil kun olien er tilbage. 11. Vej bægerglasset med olie i og noter vægten i skemaet. 12. Chips kan hældes i skraldespanden og olie i vasken efter forsøget. Glasvarer skal i opvaskemaskinen og pladsen ryddes og gøres rent.

Skema:
Chips
Navn på chips | Fedtindhold pr. 100 g | Energiindhold pr. 100 g | Forventet masse af fedt i chips massen | Masse af chips (g) | Kims og Crusti saltet | 32 % | 2230 kJ - 523 kcal | 3,2384 g | 10,120 g |

Bægerglas Masse af rent bægerglas (g) | Masse af bægerglas med olie (g) | Masse af fedtstof (g) | 109,301 | 111,740 | 2,439 |

Masseprocent Beregnet masseprocent | Masseprocent ifølge varedeklarationen | | |

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