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Laboverslag zuur base titratie
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Laboverslag van d zuur/base titratie 2
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Naam: Kobe LimbourgKlas: 1 BLT D
Datum: 15/11/2021
Verslag Labosessie 6: Zuur/Base titratie 6:
Doel:
1) Bepalen van de concentratie van de secundaire standaard (HCl) en de onbekende stof
(NaOH) door te stellen. De concentratie van HCl bepalen door minstens 5 keer te
titreren. Om de concentratie van NaOH te bepalen titreer minstens 3 keer. [1][3]
Principe:
De concentratie van de secundaire standaard (HCl) wordt bepaald door deze te stellen met
een primaire standaard (Na2CO3).
Na het stellen is de concentratie van HCl exact gekend en wordt deze concentratie gebruikt
om de concentratie van de onbekende (NaOH) te bepalen.
Om het equivalentiepunt te visualiseren wordt de indicator methyloranje xyleencyanol FF
gebruikt. (omslaggebied Ph= 3,8) [1][3]
Reacties:
fHCl= 1
fNa2CO3= 2
Figuur 1: Reactievergelijking natriumcarbonaat en waterstofchloride.
Figuur 2: reactievergelijking natriumwaterstofcarbonaat en waterstofchloride.
NaOH + HCl H2O + NaCl fHCl= 1
fNaOH= 2
Figuur 3: reactievergelijking titratie onbekende (NaOH) en HCl.
[1][3]
Benodigde reagentia:
, Primaire stof:
Na2CO3
m= C*V*M
m= 0,05000 mol/l * 0,2500l *106,0g/mol
m= 1,325g
Secundaire stof:
HCl
- 37g HCl 100g oplossing
- 12,078 mol 1000ml
0,10 mol
∗1,0 l
V1= l
12 mol/ l
C1= 12 mol/l
V2= 1,0l
C2= 0,10mol/l
V1= +- 8ml
In labo:
Na2CO3= 1,4229g afgewogen
[1][3][4]
Gebruikte toestellen:
Glaswerk:
Weegglaasje
Bekers (100ml)
Buret (50,00ml)
Erlenmeyer (250ml)
Maatkolf (250,0ml)
Trechters
Baxterfles (1l)
Buikpipet (20,00ml)
Toestellen:
Droogstoof “memmert” type U50 Analis
Analytische balans “Mettler Toledo XSR104”
[1][4]
Onbekenden:
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