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Neutralisation

In this worksheet, students will learn about neutralisation - the reaction of an acid with an alkali.

'Neutralisation' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Chemical Reactions

Curriculum subtopic:   Acids and Alkalis: Neutralisation Reactions

Difficulty level:  

Worksheet Overview

Acids and alkalis react together to form new products in a neutralisation reaction.

 

If exactly the right amount of alkali is added to an acid, the resulting solution will have a pH of seven because the acid and alkali will 'cancel' each other out.

 

Indicator scale for pH

 

This means that the pH of the acid increases towards seven during neutralisation, but the pH of the alkali decreases towards seven. 

 

Neutralisation reactions are performed every day. For example in the treatment of acid indigestion, or a farmer adding quicklime (an alkali) to his fields to neutralise acidic soil.

 

Acids and alkalis can also be used to treat insect stings:


 

Calamine lotion (an alkali) can be used to treat bee stings which are acidic.

 

Vinegar (an acid) can be used to treat wasp stings which are alkaline.  

 

 

...Just don’t get the two mixed up or it may make the sting more painful – ouch!

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