Lesson 7 of 7
Using neutralisation
Goal: Explain everyday uses of neutralisation.
Neutralisation is useful wherever there is too much acid.
New word: a base is any substance that neutralises an acid. An alkali is a base that dissolves in water.
Swipe to see three uses.
Indigestion tablets
Your stomach makes acid to help digest food.
Too much gives you indigestion. The tablet contains a base, which neutralises the extra acid.
Lime on fields
Some soil is too acidic for crops to grow well.
Farmers spread lime, which is a base, to neutralise it.
Toothpaste
Bacteria in your mouth make acid that attacks your teeth.
Most toothpaste is slightly alkaline, so it helps to neutralise the acid.
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Key words in this lesson
Acid Has a pH below 7
Alkali Has a pH above 7
Neutral pH 7, neither acid nor alkali
Neutralisation An acid and an alkali cancelling out
Base Any substance that neutralises an acid