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Flowchart lab 4
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Uitgewerkt stappenplan voor lab 4 (examen lab)
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Stappenplan en flowchartStap 1: SO₃²⁻ en SO₄²⁻ scheiden van S₂O₃²⁻ en S²⁻
Neerslag Type neerslag (vlokkig of fijn) Besluit
Toevoegen Sr²⁺ ja Fijn en vlokkig SO₃²⁻ en/of SO₄²⁻
nee / geen SO₃²⁻ en geen SO₄²⁻
Reactievergelijking (toevoegen Sr²⁺) Type neerslag (vlokkig of fijn)
SrSO₃ Sr2+ + SO32- SrSO3 Fijne, witte neerslag
SrSO₄ Sr2+ + SO42- SrSO4 Witte, vlokkige neerslag
2+
Toevoegen van Sr (druppelsgewijs in overmaat toevoegen)
Gevormde neerslag filtreren bekomt: neerslag a en filtraat b
Bij neerslag a:
-> aan filtraat nog Sr2+ toevoegen en filtreren ter controle (tot geen neerslag meer gevormd
wordt)
Wasstap: 3X toepassen (laatste wasstap in proefbuis opvangen)
-> I3- (joodwater) toevoegen aan proefbuis => ontkleuring van joodwater bij
thiosulfaatanionen, dan extra wasstap
Stap 2: Aan- of afwezigheid van SO₃²⁻ en SO₄²⁻ aantonen
Toevoeging van 10 druppels HCL (2M)
Lost neerslag volledig op? Besluit
Toevoegen HCl 2 M ja SO₃²⁻ aanwezig
SO₄²⁻ afwezig
nee SO₄²⁻ aanwezig
Reactievergelijking (toevoegen HCl 2 M)
SrSO₃ SrSO3 + 2H+ H2SO3 + Sr2+
SrSO₄ SrSO4 + H+ HSO4- Sr2+
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