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Practicum limiterend reagens

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Naam: Laura Lens & Ophélie De Mol Plaatsnummer: 49+50 Datum: 12/10/2017 nr. onbekende: 25



2 LIMITEREND REAGENS


DOEL

- Limiterend reagens bepalen van een mengsel van 2 oplosbare zouten.
- Percentage samenstelling van elke verbinding in het mengsel bepalen.

REACTIEVERGELIJKING

CaCl 2 . 2 H 2 O ( aq )+ K 2 C 2 O4 . H 2 O ( aq ) → CaC 2 O4 . H 2 O ( s ) +2 KCl ( aq ) +2 H 2 O ( l )




RESULTATEN

Analytische balans moest je tot op
Herhaling 1 Herhaling 2 Herhaling 3
0,1 mg aflezen!


Massa zoutmengsel (g): 1,009 1,012 1,008


Massa papierfilter (g): 0,875 0,877 0,875


Massa papierfilter + neerslag (g): 1,235 1,220 1,252


Massa neerslag CaC2O4∙H2O (g): 0,360 0,343 0,377


Massa neerslag CaC2O4 (g): 0,316 0,300 0,331


Limiterend reagens: CaCl 2 . 2 H 2 O

, Naam: Laura Lens & Ophélie De Mol Plaatsnummer: 49+50 Datum: 12/10/2017 nr. onbekende: 25



Herhaling 1 Herhaling 2 Herhaling 3


Aantal mol neerslag (mol): 2,464 . 10-3 2,348 . 10-3 2,580 . 10-3


Aantal mol limiterend reagens in
2,464 . 10-3 2,348 . 10-3 2,580 . 10-3
zoutmengsel (mol):

Massa limiterend reagens in
0,362 g 0,345 g 0,379 g
zoutmengsel (g):

Massa reagens in overmaat in
0,647 g 0,667 g 0,629 g
zoutmengsel (g):

Massa van reagens in overmaat dat
0,454 g 0,433 g 0,475 g
reageerde (g):

Massa van reagens in overmaat,
0,193 g 0,234 g 0,250 g
niet gereageerd (g):

Procentuele samenstelling van 35,9% CaCl2.2H2O; 34,1% CaCl2.2H2O; 37,6%
zoutmengsel: 64,1% K2C2O4.H2O 65,9% K2C2O4.H2O CaCl2.2H2O;
62,4% K2C2O4.H2O

BESLUIT:

Uit de verkregen resultaten kunnen we afleiden dat het limiterend reagens in casu de caliumchloride
in oplossing is. Alle calciumchloride wordt immers gebruikt tijdens de reactie.

Verder bestaat het zoutmengsel met een massa van circa 1 g uit gemiddeld 35% CaCl 2.2H2O en 65%
K2C2O4.H2O. Dat lijkt een realistische waarde aangezien kaliumoxalaat het reagens in overmaat is en er
dus in molverhouding meer K2C2O4.H2O aanwezig zou moeten zijn dan het aantal mol calciumchloride.

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