7E ACIDS AND ALKALIS. The pH scale What is the pH scale? What pH does an acid have? What pH does an alkali have? What is the neutral pH.

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Presentation transcript:

7E ACIDS AND ALKALIS

The pH scale What is the pH scale? What pH does an acid have? What pH does an alkali have? What is the neutral pH

The pH Scale A way to measure how acidic or alkaline a substance is Universal indicator paper shows a different colour for each pH

Indicators What is an indicator? Which indicator has many different colours? Name some other indicators.

Acids and alkalis in the Science lab Which hazard symbols might acids or alkalis have? What should you do if you get acid or alkali on your skin? Why? Name two acids and two alkalis you might use in the science lab.

The power of acids

Looking at acids and alkalis in the lab

Acids and alkalis in the lab

More acids and alkalis Card sort

Indicators What is an indicator? Name 3 indicators.

Things to do: 1. Write a method for the experiment 2. Do a diagram of the experiment 3. Make your indicator and write about it is the table Colour in acidName of indicatorColour in alkali

Acid rain What is acid rain? Which gases cause acid rain?

Next Draw a diagram to show how acid rain is formed Answer the questions Do you think that the acid rain problem in the UK is over or not? Explain your answer with evidence from your work. How can countries try to solve the acid rain problem?

Neutralisation What is neutralisation? Complete this formula Acid + Alkali → Name 3 examples of when neutralisation is useful.

Neutralisation Put 8cm 3 of alkali in a test tube Add 1 cm 3 of acid, stir and remove a drop of liquid Test the pH Wash the dropper Add 1 cm 3 more of acid Volume of acid (cm 3 )pH …

Your task is to design a page in a family health book all about insect stings and how to treat them. Step 1 Find out the pH of wasp and bee stings. Insect sting Colour with universal indicator pH Wasp Bee Step 2 To get rid of an insect sting you need to neutralise it. What pH will neutralise the: a) Wasp sting? b) Bee sting? Step 3 Find out the pH of these household chemicals. ChemicalColour with universal indicator pH Vinegar Water Bicarbonate of soda Step 4 Which chemical would you use to treat the: a) Wasp sting? b) Bee sting? Step 5 Design your book page on plain A4 paper. Try to find out this extra info: What are the chemicals in wasp and bee stings?