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Practicum Titratie aminozuur

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Volledige verslagen voor algemene chemie praktijk (L. Baeten), Practica zijn per 2, wat dus maakt dat jullie voor €12 safe zitten

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Namen: Laura Lens & Ophélie De Mol datum: 10/11/2017 plaatsnummer(s): 49 & 50


4 TITRATIE VAN EEN AMINOZUUR: POTENTIOMETRISCHE TITRATIE


4.1 SJABLOON VERSLAG

OPMERKING: - Lees de vragen aandachtig!
- Overschrijd de opgegeven ruimte niet!
- Berekeningen, tabellen en grafieken worden als bijlage toegevoegd!

DOEL

 De concentratie van het aminozuur alanine bepalen
 Een titratiecurve opstellen met behulp van een potentiometrische titratie van volledig
geprotoneerd alanine en de sterke base NaOH
 pKa-waarden van alanine bepalen en vergelijken met literatuurwaarden


REACTIEVERGELIJKINGEN


NH3+CHCH3COOH (aq) + NaOH (aq)  Na+ (aq) + -OOCCH(CH3)NH3+ (aq) + H2O (l)

-
OOCCH(CH3)NH3+ (aq) + NaOH (aq) Na+ (aq) + NH2(CH3)CHCOO- (aq) + H2O (l)


RESULTATEN
A. Brutotitratie Alanine met NaOH
Molariteit NaOH: (1,000 ± 0,002) M


Buretstand begin: 5,50 mL


Buretstand einde: 24,25 mL


Volume equivalentiepunt 1: 18,75 mL


Volume equivalentiepunt 2: 37,50 mL


Molariteit Alanine oplossing *: 0,9375 M


* Berekening in bijlage toevoegen
B. Potentiometrische titratie alanine met NaOH (Maak kader langer, afhankelijk van je
gegevens, alle gemeten punten moeten weergegeven worden)


1

, Namen: Laura Lens & Ophélie De Mol datum: 10/11/2017 plaatsnummer(s): 49 & 50

V NaOH (ml) pH ∆V ∆pH ∆pH/∆V middelpuntsvolume




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