1. What happens when you mix acids and alkalis?
L/O – To understand neutralisation

2. What has happened here? The acid remains at the top
The acid and alkali mix in the middle to produce a neutral
This is
called
Neutralisation
The alkali sinks to the bottom

3. You are going to be given a selection of acids and alkalis.
Your task is to create 2 different neutral substances and to be able to say which is the strongest acid
What are you going to do?
When the acid and alkali react they create a salt and water
Acid + Alkali  Salt + Water
Hydrochloric acid + Sodium Hydroxide  Sodium Chloride + water
What salt have you created?
Can you write out word equations for each of your neutral solutions
How will you know when you have a neutral solution?
How will you know which acid you use is the strongest?

4. Stings What would you put on each of these stings to ease the pain?
A bee sting is acidic
A wasp sting is alkaline
What would you put on each of these stings to ease the pain?
Why can bicarbonate of soda (pH 9) be used to treat a bee sting?
Why can vinegar (pH 3) be used to treat a wasp sting?
Adding just the right amount of acid or alkali to the sting causes it to neutralise!