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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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Do now

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

Do now!


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 indicator

Universal Indicator


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.


Measuring ph1

Measuring pH


Today s lesson

Today’s lesson

  • What happens when we mix acids and alkalis

  • A string acid!


Mission impossible

Mission impossible?


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 impossible2

Mission impossible?


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!


A strong acid

A strong acid!


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