1. Neutralisation
Lesson 7

2. Learning intentions Describe the process of neutralisation
Evaluate the usefulness of indicators
Discuss the reliability of data collected using indicators

3. Acids and Alkalis What do you remember? Can you think of 5 points?

4. Practical

5. Method
Using a spotting tile – take 5 drops of the acid or alkali to be tested
Add 3 drops of your chosen indicator
Note the colour
Repeat for different strengths and different indicators

6. Note the colour in the table below
Indicator
Strong acid
Weak acid
Water
Weak alkali
Strong alkali
Universal
Litmus
Methyl Orange
Phenolphthalein

7. Suitability of indicators
Were all indicators you tested suitable for testing a wide range of items?

8. Practical 2 Take 10cm3 of 0.5M HCl in a small beaker
Add 10 drops of universal indicator
Slowly add 0.5M NaOH to the solution. Stop when you have reached neutral and note the volume added

11. Plenary