pH Scale

This lesson explores how to use universal indicator to identify a substance as acid, alkali, or neutral based on its pH and why universal indicator is better than simple indicators.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 2

Question 2

Question 3

Question 3

Question 4

Question 5

Question 5

Question 5

Question 6

Question 6

Question 7

Question 8

Q1.What does this hazard symbol mean?

1/7

Q2.Which other word describes a hazard for both acids and alkalis?

2/7

Q3.Match the every day item with whether it is an acid or an alkali (tick either acid or alkali for each item)

Lemon juice

Select one (1) boxes

Soap

Select one (1) boxes

Toothpaste

Select one (1) boxes

Washing up liquid

Select one (1) boxes

Vinegar

Select one (1) boxes

Washing powder

Select one (1) boxes

Indigestion tablets

Select one (1) boxes

3/7

Q4.What do we commonly use to identify acids and alkalis?

4/7

Q5.What happens to red litmus paper in acid?

5/7

Q6.What happens to blue litmus paper in acid?

6/7

Q7.Revision: if a chemical reaction bubbles, what does this mean?

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 2

Question 2

Question 3

Question 3

Question 4

Question 5

Question 5

Question 5

Question 6

Question 6

Question 7

Question 8

Q1.What does this hazard symbol mean?

1/7

Q2.Which other word describes a hazard for both acids and alkalis?

2/7

Q3.Match the every day item with whether it is an acid or an alkali (tick either acid or alkali for each item)

Lemon juice

Select one (1) boxes

Soap

Select one (1) boxes

Toothpaste

Select one (1) boxes

Washing up liquid

Select one (1) boxes

Vinegar

Select one (1) boxes

Washing powder

Select one (1) boxes

Indigestion tablets

Select one (1) boxes

3/7

Q4.What do we commonly use to identify acids and alkalis?

4/7

Q5.What happens to red litmus paper in acid?

5/7

Q6.What happens to blue litmus paper in acid?

6/7

Q7.Revision: if a chemical reaction bubbles, what does this mean?

7/7

Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

  • Click "Close Video"
  • Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

pH scale

This quiz will test your understanding from today's lesson and some prior knowledge too.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Which of these chemicals can be used to identify acid and alkali?

1/7

Q2.Which chemical turns a range of colours and can show the strength of acids and alkalis?

2/7

Q3.Which pH number shows that a solution is neutral?

3/7

Q4.What colour do neutral solutions turn when universal indicator is added?

4/7

Q5.Which of these pH numbers represents the strongest acid?

5/7

Q6.Which of these pH numbers represents the weakest alkali?

6/7

Q7.Revision: what are the products of methane (a fuel) being burnt in air?

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

pH scale

This quiz will test your understanding from today's lesson and some prior knowledge too.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Which of these chemicals can be used to identify acid and alkali?

1/7

Q2.Which chemical turns a range of colours and can show the strength of acids and alkalis?

2/7

Q3.Which pH number shows that a solution is neutral?

3/7

Q4.What colour do neutral solutions turn when universal indicator is added?

4/7

Q5.Which of these pH numbers represents the strongest acid?

5/7

Q6.Which of these pH numbers represents the weakest alkali?

6/7

Q7.Revision: what are the products of methane (a fuel) being burnt in air?

7/7

Lesson summary: pH Scale

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