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Labtesten Extractie met oplossingen: Versie A,B,C,D.
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Naam: Datum:Klas:
Labportfolio semester 2 – scheidingstechnieken – extractie a / 10
1. Twee studenten moeten een extractie uitvoeren met ether van 4 g methylfenylketon
opgelost in 150 ml water. Student A voert 2 opeenvolgende extracties uit met telkens
25 ml ether. Student B voert 1 extractie uit met 50 ml ether. De verdelingscoëfficiënt
K naar ether is 20.
Welke student voert de efficiëntste extractie uit? Staaf je antwoord met berekeningen.
MFKwater MFKether met K = 20
[𝑀𝐹𝐾]
met K = [𝑀𝐹𝐾] 𝑒𝑡ℎ𝑒𝑟
𝑤𝑎𝑡𝑒𝑟
student A:
1e extractie met 25 mL ether
𝑥
25 = 20
4−𝑥
150
⇒ 𝑥 = 3,076 𝑔 ⇒ 𝑟𝑒𝑠𝑡 𝑛𝑜𝑔 0,923 𝑔 𝑀𝐹𝐾 𝑖𝑛 𝑤𝑎𝑡𝑒𝑟
2e extractie met 25 mL ether
𝑥
25 = 20
0,92 − 𝑥
150
⇒ 𝑥 = 0,71 𝑔 ⇒ 𝑟𝑒𝑠𝑡 𝑛𝑜𝑔 0,213 𝑔 𝑀𝐹𝐾 𝑖𝑛 𝑤𝑎𝑡𝑒𝑟
student B:
één extractie met 50 mL ether
𝑥
50 = 20
4−𝑥
150
⇒ 𝑥 = 0,3,478 𝑔 ⇒ 𝑟𝑒𝑠𝑡 𝑛𝑜𝑔 0,521 𝑔 𝑀𝐹𝐾 𝑖𝑛 𝑤𝑎𝑡𝑒𝑟
Conclusie: 0,521 g MFK > 0,213 g MFK (in water); dus student A behaalt het beste resultaat.
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