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Do now!

Don’t forget you have a digestion test on Friday. Do some study whilst you are waiting. Do now!. Last lesson. Making and investigating indicators. Making an Indicator. Today’s lesson. Measuring the strength of acids and alkalis The pH scale Using “Universal Indicator”. The pH scale.

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Do now!

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

  2. Last lesson Making and investigating indicators

  3. Making an Indicator

  4. Today’s lesson • Measuring the strength of acids and alkalis • The pH scale • Using “Universal Indicator”

  5. The pH scale The strength of an acid is measured on the pH scale pH stands for the “potential of hydrogen”

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

  7. Universal Indicator

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

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

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

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

  12. Measuring pH

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