A scale from 1 to 14 used to measure the acidity or alkalinity of solutions. pH7 is for neutral solutions.

The amount of chemical dissolved in a certain volume of solution.

pH scale and universal indicator solution

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.

Acids and bases

Physical activity and equipment requiring safe use

Measures the acidity or alkalinity of solutions.

Match the keyword to the correct statement.

A bee sting is acidic. What colour would universal indicator turn?

Four solutions were tested with universal indicator. Rank the results in terms of acidity. Place the most acidic solution first.

The higher the concentration of hydrogen, the lower the pH.

The higher the concentration of hydrogen, the higher the pH.

The lower the concentration of hydrogen, the higher the pH.

The lower the concentration of hydrogen, the lower the pH.

Select the correct statements about concentration of hydrogen and pH.

Solution A has a pH of 8 and solution B has a pH which is 1000 times more alkaline. What is the pH of solution B?

A substance which reacts with an acid to form a salt and water.

Match the keyword to the correct statement

New products are made when a chemical reaction occurs.

New reactants are made when a chemical reaction occurs.

The total mass of reactants is the same as the total mass of the products.

No new substances are formed when a chemical reaction occurs.

Which of these statements about chemical reactions are true?

What is the result if blue litmus paper is dipped into lemon juice?

What is the result if red litmus paper is dipped into soapy water?

True or false? Vinegar can be used to neutralise sodium hydroxide.

Which containers of liquid may require a corrosive hazard label?

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

pH scale and universal indicator solution

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.