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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:  

down

Worksheet Overview

QUESTION 1 of 10

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.

 

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 everyday. For example, in the treatment of acid indigestion or a farmer adding lime (an alkali) to his fields to neutralise acidic soil. Acids and alkalis can also be used to treat insect stings:


 

Camomile can be used to treat bee stings which are acidic.

 

Vinegar can be used to treat wasp stings that are alkaline.  

 

 

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

Using the table below, decide whether the substances listed are acidic, alkaline or neutral:

 acidic alkaline neutral
Lime
Water
Vinegar
Calamine
Indigestion remedies

Tick the substances below that would neutralise an acid:

vinegar

lemon juice

chalk

bicarbonate of soda

lime

fizzy drink

calamine lotion

Using the table below, decide which of the followng substances would neutralise an alkali:

vinegar

lemon juice

chalk

bicarbonate of soda

lime

fizzy drink

calamine lotion

Type this sentence out again in the answer box below, filling out the gap with the correct word. Don't forget the full stop!

 

When an acid is neutralised its pH _________ towards pH 7.

Type this sentence out again in the answer box below, filling out the gap with the correct word. Don't forget the full stop!

 

When an alkali is neutralised its pH _________ towards pH 7.

Which of the following would neutralise a bee sting?

 

Vinegar

Lemon juice

Baking soda

Which of the following would neutralise a wasp sting?

 

Vinegar

Milk of magnesia

Baking soda

Match the substances on the right that would neutralise the substances on the left.

Column A

Column B

Vinegar
Bicarbonate of soda
Sodium hydroxide
Hydrochloric acid
  • Question 1

Using the table below, decide whether the substances listed are acidic, alkaline or neutral:

CORRECT ANSWER
 acidic alkaline neutral
Lime
Water
Vinegar
Calamine
Indigestion remedies
EDDIE SAYS
It is important to know common acids and alkalis that are used both in the home and in the science lab.
  • Question 2

Tick the substances below that would neutralise an acid:

CORRECT ANSWER
chalk
bicarbonate of soda
lime
calamine lotion
EDDIE SAYS
All of these substances are alkaline and would therefore neutralise an acid.
  • Question 3

Using the table below, decide which of the followng substances would neutralise an alkali:

CORRECT ANSWER
vinegar
lemon juice
fizzy drink
EDDIE SAYS
These substances are acidic, so they would neutralise an alkali.
  • Question 4

Type this sentence out again in the answer box below, filling out the gap with the correct word. Don't forget the full stop!

 

When an acid is neutralised its pH _________ towards pH 7.

CORRECT ANSWER
When an acid is neutralised its pH increases towards pH 7.
When an acid is neutralised its pH rises towards pH 7.
EDDIE SAYS
During neutralisation the pH of an acid increases towards 7 and the pH of an alkali decreases towards 7.
  • Question 5

Type this sentence out again in the answer box below, filling out the gap with the correct word. Don't forget the full stop!

 

When an alkali is neutralised its pH _________ towards pH 7.

CORRECT ANSWER
When an alkali is neutralised its pH decreases towards pH 7.
When an alkali is neutralised its pH falls towards pH 7.
EDDIE SAYS
Neutralisation of an acid or alkali moves the pH towards 7.

Alkalis have a pH greater than 7 so the pH will decrease during neutralisation and acids have a pH of less than 7 so their pH will increase during neutralisation.

  • Question 6

Which of the following would neutralise a bee sting?

 

CORRECT ANSWER
Baking soda
EDDIE SAYS
Bee stings are acidic so an alkali such as baking soda will neutralise the sting.
  • Question 7

Which of the following would neutralise a wasp sting?

 

CORRECT ANSWER
Vinegar
EDDIE SAYS
Wasp stings are alkaline so an acid such as vinegar would neutralise the sting.
  • Question 8

Match the substances on the right that would neutralise the substances on the left.

CORRECT ANSWER

Column A

Column B

Vinegar
Bicarbonate of soda
Sodium hydroxide
Hydrochloric acid
---- OR ----

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