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Look at the companion sheet and use the information above to match the correct infomation to the correct variable.
Task 1 - Acid or alkali?
Task 1 - Acid or alkali?
An acid is a liquid that contains Hydrogen ion (H+)
An alkali is a liquid that contains Hydroxide ions (OH-)
These liquids can cause irritation to the skin and even burns
The pH scale shows how acidic a substance is. It can be measured using a pH meter which gives a numerical value.
The pH scale ranges from 0 (very acidic) through 7 (neutral) to 14 (very alkaline).
pH can be also be measured using an indicator and comparing the colour with a comparison chart.
The pH scale
The pH scale
Task 3 - refelctive thinking
Task 3 - refelctive thinking
Answer the following questions on your companion sheet.
What is the job of the indicator?
Why do we record the pH number and not just the colour?
What do you think might happen if you add an acid to an alkali?
TAsk 4 - Neutralisation
TAsk 4 - Neutralisation
Watch the video and write down your observations.
What changes can you see?
Why do you think the changes occur?
Task 5 - Treating stings
Task 5 - Treating stings
Use the template on the companion sheet to plan an investigation to see what treats bee and wasp stings best.
Think about :-
Are wasp and bee stings alkaline or acidic?
What do you need to do to make the sting feel better
What chemical would you use to aceive this affect?
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