a substance that reacts with an acid to form a compound called a salt.

a soluble base that has a pH of greater than 7.

used to test if a solution is an acid or an alkali.

can react to damage substances or cause chemical burns on skin.

Acids and bases

Science

In the unit Making salts, pupils will build on this knowledge to learn about the production of pure salts, and about why acids are acidic and how bases can neutralise them. 

In the Understanding Chemical Reactions unit, pupils learned how atoms rearrange to form new substances during chemical reactions.

This unit covers acids, alkalis, and their neutralisation reactions, the pH scale, and the reactions of acids with metals and alkalis. It also examines the chemical properties of metal and non-metal oxides. Emphasis is on evaluating risks, using appropriate techniques, and making observations.

Physical activity and equipment requiring safe use

Citric acid is found in many fruits. What does it taste like?

Which of the following hazard symbols is found on corrosive substances?

A substance that reacts with acid to form a salt

A water soluble substance with a pH greater than 7

Which statement is the best definition of an alkali?

The red litmus paper would turn colourless

A student tested a solution with red litmus paper. What result would the student see if the solution was an acid?

Red litmus paper turns blue in an alkaline solution

Blue litmus paper stays blue in an alkaline solution

Red litmus paper turns blue in an acidic solution

Blue litmus turns red in an acidic solution

The red and blue litmus papers were faulty and the test should be repeated.

An unknown solution was tested to see if it was an acid with red and blue litmus paper. The red litmus paper stayed red and the blue litmus paper stayed blue. Which statement is correct?

Carry out a reaction with a known substance

What should you never do in order to see if a liquid is acidic?

Which part of our body releases hydrochloric acid to kill bacteria on our food?

Vinegar is an acid. When it is added to bicarbonate of soda, a chemical reaction occurs. The mixture fizzed showing a {{}} was being released.

Naturally occurring acids are often found in fruit making them taste sour. Which fruit contains the least acid?

The atoms rearrange themselves to form new substances

The atoms disappear because the acid has reacted

What happens to the atoms in an acid during a chemical reaction?

Which of the following are not chemical properties?

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet