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Stappenplan lab 6
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uitgewerkt stappenplan labo 6 (examen lab)
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StappenplanStap 1: staal klaar maken
-> Onbekende poeder fijn maken in mortier
->verdelen in 2 => 1 deel 25mL H2O demi toevoegen
Stap 2: droogreacties
->mespunt poeder toevoegen aan proefbuis + 5 druppels H2SO4 conc
-> vergelijk waarneming met eerdere droogreacties
Reactievergelijking Waarneming
- 2-
2 F + H2SO4 c 2 HF + SO 4
Cl + H2SO4 c HCl + HSO4-
-
Br- + H2SO4 c HBr + HSO4-
2 HBr + H2SO4 c SO2 + 2 H2O + Br2 Rode dampen
I- + H2SO4 c HI + HSO4-
8 HI + H2SO4 c H2S + 4 H2O + 4 I2 Paarse dampen of grijze schilfers
Stap 3: waterige reacties
1) Aanwezigheid van F- aantonen
A: met Ca2+
->2ml onbekende oplossing + enkele druppels Ca2+
Ca2+ + 2F- CaF2 Wit- troebel
B: met Fe3+
->aan 1ml gele Fe3+ 2ml onbekende oplossing toevoegen (deze volgorde)
verkleuring door verdunning Licht geel F- en I- afwezig
geel Fe3+
Fe3+ + 3 F- FeF3 Troebel F- aanwezig
Fe3+ + 6 F- FeF63- Kleurloos F- aanwezig
2 Fe3+ + 3 I- 2 Fe2+ + I3- Geel-bruin I- aanwezig, F- afwezig
->toeven n-hexaan= bewijst aanwezigheid I- paarse organische fase
2) Aanwezigheid van I- aantonen (mogelijk Br-)
-> aan 2ml onbekende oplossing, 1ml Cl2-water toevoegen en 1 ml n-hexaan
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