Acidulants

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List of Activities
Activity Description Subject(s) Level

Some reactions between acids and alkalis

Citric acid and sodium bicarbonate are dissloved in water to give two commonly used solutions in the food industry.

The pH of these solutions is measured and their reaction observed when mixed together.

The level of acid in a range of drinks is measured using Universal indicator. An extension activity uses a more accurate titration to determine the level of acid.

Science

KS3 and above

Boiling dumplings

Students do practical activities to investigate raising agents and how they are affected by different pH.

Carbon dioxide is needed to make the dumplinmg rise and students find that a combination of acid and alkali is necessary to give acceptable results.

Science

KS3 and above

Acids and alkalis in food

The reactions between acids and alkalis are important in the production of food.

Sherbert contains citric acid and sodium bicarbonate. These react to form the characteristic fizz of sherbert on the tongue.

Acids can be found in many drinks. Fruit juices and carbonated drinks are tested to find their pH.

Science

Food Technology

KS3 and above

Baking scones

Foods containing flour must be baked before they can be eaten. this alters the starch in the flour so that it becomes digestible.

Cakes and bread contain a raising agent that contains an acid and an alkali. These react to liberate carbon dioxide which makes the baking flour rise.

Students investigate different combinations of raising agents in the baking of scones.

Science

Food Technology

KS3 and above

Citric Acid

Foods like oranges, lemons, yoghurt and apples have a sharp taste because they contain naturally-occuring acids. Citrus fruits contain citric acid, apples contain malic acid and yoghurts are rich in lactic acid.

In this paper-based activity, students summarise the functions and uses of citric acid as a food additive.

Science

Food Technology

KS3 and above