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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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Presentation Transcript
last lesson
Last lesson
  • Measuring the strength of acids and alkalis
  • The pH scale
  • Using “Universal Indicator”
the ph scale
The pH scale

strong acid

pH stands for the “potential of hydrogen”

weak acid

weak alkali

Strong alkali

universal indicator1
Universal Indicator

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

Universal Indicator

universal indicator2
Universal Indicator

It comes in the form of a paper

universal indicator3
Universal Indicator

It also comes in the form of a liquid

measuring ph
Measuring pH

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

today s lesson
Today’s lesson
  • What happens when we mix acids and alkalis
  • A string acid!
mission impossible1
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.

mission impossible3
Mission impossible?

The first group to succeed will receive 3 house marks each

mission impossible4
Mission impossible?

Don’t forget safety glasses!

Use SMALL amounts – it’s easier!