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The Death

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Submitted By xvan2009
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Opløsningsmidlers egenskaber.
Formål: at undersøge opløseligheden af nogle forskellige stoffer i 3 forskellige opløsningsmidler. Endvidere skal I undersøge den indbyrdes blandbarhed af de tre opløsningsmidler.
Materialer: Reagensglas med propper, stativ, spatler

Kemikalier:
Ethanol, CH3CH2OHNatriumchlorid, NaCl
Heptan, CH3CH2CH2CH2CH2CH2CH3Glukose, C6H12O6
Vand, H2OPlanteolie
Diiod, I2

Fremgangsmåde:
De tre opløsningsmidler er ethanol, heptan og vand. I skal undersøge opløseligheden af stofferne natriumchlorid, glukose, planteolie og diiod.
I skal selv designe undersøgelsen af stoffernes opløselighed. Det er vigtigt, at I både noterer, hvilken metode I anvender og jeres overvejelser om metoden. Det er også vigtigt, at I diskuterer jeres overvejelser og valg af metode med læreren, inden I går i gang med forsøget. Opskriv hypoteser og brug nedenstående skemaer til jeres resultater.
Opløsningerne i dette forsøg må IKKE hældes i vasken efter brug, men skal opsamles i bægerglas.
I skal kun bruge små mængder kemikalier. I skal arbejde under sug og I skal have kittel, briller og handsker på.

Vi starter med at undersøge hvordan de forskellige stoffer fungerer som opløsningsmidler. Vi tager først fire reagensglas, og putter lidt vand i. Derefter putter vi NaCl, Glucose, Planteolie og Diiod i hver af dem. Dette gøre i igen efter med Ethanol og Heptan som opløsningsmiddel.

Resultater: Stof | Vand | Ethanol | Heptan | NaCl | Noget opløselig | Ikke opløselig | Ikke opløselig | Glucose | Opløselig | Noget opløselig | Opløselig | Planteolie | Ikke opløselig | Ikke opløselig | Ikke opløselig | I2 | Ikke opløselig | Ikke opløselig | Opløselig |

Stof | Vand | Ethanol | Heptan | Vand | | Opløselig | Noget opløselig | Ethanol | Opløselig | | Opløselig | Heptan | Noget opløselig | Opløselig | |

Spørgsmål: På baggrund af jeres viden om de undersøgte stoffers opbygning skal I prøve at redegøre for deres opløselighed i de tre opløsningsmidler. Stemmer jeres eksperimentelle resultater med jeres forventninger? Vi forventede at NaCl var letopløseligt, men vores resultater viser ikke dette. Dette kan skyldes, at vi har tilføjet for meget NaCl i opløsningsmiddel. Hvad kan I sige generelt om ethanols egenskaber som opløsningsmiddel sammenlignet med vand og benzin? Ethanols egenskaber som opløsningsmiddel, er mindre effektive end benzin og vand.

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