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OCR A-level Chemistry Organic acids

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.

Carboxylic 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.

Amino acids

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.

Ester formation

A dicarboxylic acid contains two -COOH functional groups. They are used in the production of copolymers.

Dicarboxylic acids

1

What products are produced if you hydrolyse an ester with a base?

What products are produced if you hydrolyse an ester with a base?

2

Draw the dicarboxylic acid Cβ‚„Hβ‚„Oβ‚„.

Draw the dicarboxylic acid Cβ‚„Hβ‚„Oβ‚„.

3

What is the name of the bonds between amino acids in protein chains?

What is the name of the bonds between amino acids in protein chains?

4

Give the IUPAC name of the amino acid pictured, Valine.

Give the IUPAC name of the amino acid pictured, Valine.

5

Draw a diagram showing a condensation reaction occuring joining two amino acids to form a peptide bond in a protein.

Draw a diagram showing a condensation reaction occuring joining two amino acids to form a peptide bond in a protein.

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