1. What’s the link?

2. Learning Intention
I understand the purpose of chemical indicators and use my knowledge to identify unknown chemicals

3. Can be either DILUTE or CONCENTRATED
Acids and Alkalis
Can be either DILUTE or CONCENTRATED

4. Concentrated Solutions
Corrosive
Attack and destroy

6. Dilute Solutions
Irritant
Common household products

7. Acids and Alkalis
Similar effects
Opposites
Chemical test to identify

8. Indicators
Iodine
Lime water
Universal indicator
pH paper

9. Result with universal indicator
Complete
Type of Solution
Result with pH paper
Result with universal indicator

10. Experiment Apparatus Milk, coke, water Dimple tray Litmus paper
Procedure
Goggles on and hair up
Dip pH paper into each drink
Note the colour change of each on your hand out and decide which drink is Acid, Alkaline and Neutral

11. Drink
Colour of pH paper
Space of pH paper
Acid, Alkali or neutral?
Milk
Water
Coke

12. Success Criteria
I can describe the difference between a concentrated and a dilute acid/alkali
I can explain what an indicator is and give examples
I can describe the colour change that occurs in an indicator in the presence of an acid/alkali/neutral
I can use a chemical indicator to identify acids, alkalis and neutrals

13. Homework
Bring in your own plant materials to make your own indicator. Brightly coloured flower petals Coloured fruit/veg