OCR A-level Chemistry Organic acids
This page covers the following topics:
1. Carboxylic acids
2. Amino acids
3. Ester formation
4. Dicarboxylic acids
A carboxylic acid is an organic compound containing a carboxyl group (a carbon double bonded to an oxygen atom (O) and single bonded to an hydroxide (OH)) written as C(=O)OH. The formula of a carboxylic acid is R-COOH, with the R representing a carboxyl group. Carboxylic acids are weak acids.
Amino acids are organic compounds, containing Carbon, Oxygen, Hydrogen, Nitrogen and a variable side chain group, here represented by 'R'. A chain of amino acids connected by peptide bonds forms a protein.
Esters are compounds formed by a condensation reaction between a carboxylic acid and an alcohol, known as esterification. The functional group of an ester is (-COO), known as an ester link.
A dicarboxylic acid contains two -COOH functional groups. They are used in the production of copolymers.
What products are produced if you hydrolyse an ester with a base?
Draw the dicarboxylic acid C₄H₄O₄.
What is the name of the bonds between amino acids in protein chains?
Give the IUPAC name of the amino acid pictured, Valine.
Draw a diagram showing a condensation reaction occuring joining two amino acids to form a peptide bond in a protein.
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