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Do now!

Don’t forget you have a digestion test tommorow. Do some study whilst you are waiting. Do now!. Last lesson. Measuring the strength of acids and alkalis The pH scale Using “Universal Indicator”. The pH scale. strong acid. pH stands for the “ potential of hydrogen ”. weak acid.

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Do now!

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  1. Don’t forget you have a digestion test tommorow. Do some study whilst you are waiting. Do now!

  2. Last lesson • Measuring the strength of acids and alkalis • The pH scale • Using “Universal Indicator”

  3. The pH scale strong acid pH stands for the “potential of hydrogen” weak acid weak alkali Strong alkali

  4. Universal Indicator

  5. Universal Indicator To measure pH, we need an indicator that has a different colour for each value of pH Universal Indicator

  6. Universal Indicator It comes in the form of a paper

  7. Universal Indicator It also comes in the form of a liquid

  8. Measuring pH You are now going to measure the pH of various acids, alkalis and household liquids.

  9. Measuring pH

  10. Today’s lesson • What happens when we mix acids and alkalis • A string acid!

  11. Mission impossible?

  12. Mission impossible? Your task is to produce the colours of the rainbow in 6 test tubes using only Universal Indicator liquid and the acids and alkalis provided.

  13. Mission impossible?

  14. Mission impossible? The first group to succeed will receive 3 house marks each

  15. Mission impossible? Don’t forget safety glasses! Use SMALL amounts – it’s easier!

  16. A strong acid!

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