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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 study whilst you are waiting.

  • Measuring the strength of acids and alkalis

  • The pH scale

  • Using “Universal Indicator”


The ph scale
The pH scale study whilst you are waiting.

strong acid

pH stands for the “potential of hydrogen”

weak acid

weak alkali

Strong alkali


Universal indicator
Universal Indicator study whilst you are waiting.


Universal indicator1
Universal Indicator study whilst you are waiting.

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

Universal Indicator


Universal indicator2
Universal Indicator study whilst you are waiting.

It comes in the form of a paper


Universal indicator3
Universal Indicator study whilst you are waiting.

It also comes in the form of a liquid


Measuring ph
Measuring pH study whilst you are waiting.

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


Measuring ph1
Measuring pH study whilst you are waiting.


Today s lesson
Today’s lesson study whilst you are waiting.

  • What happens when we mix acids and alkalis

  • A string acid!


Mission impossible
Mission impossible? study whilst you are waiting.


Mission impossible1
Mission impossible? study whilst you are waiting.

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? study whilst you are waiting.


Mission impossible3
Mission impossible? study whilst you are waiting.

The first group to succeed will receive 3 house marks each


Mission impossible4
Mission impossible? study whilst you are waiting.

Don’t forget safety glasses!

Use SMALL amounts – it’s easier!


A strong acid
A strong acid! study whilst you are waiting.


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