A2 AQA CHEM4 3.4.8
- Created by: Nuha
- Created on: 23-04-14 12:57
3.4.8 Amino acids
Acid and base properties
· Since there is an acidic (COOH) and basic group (NH2 ) , amino acids can act as bases and acids and so they are amphoteric. They can also form salts with acids and bases
· When you add OH-, it reacts with the –COOH group to form –COO-
· When you add H+, it reacts with the NH2 group to form -NH3+
· In a zwitterion- there are 2 charged functional groups (i.e. -COO- and -NH3+). Amino acids exist as zwitterions is solid state/in solution
· Amino acids dissolve readily in water and are white crystalline solids at room temperature since the ionic bonds between zwitterions are very strong
o Stronger than vdw between regular amines/carboxylic acids
· Due to the asymmetric central carbon…
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