Do now! Can you spell the following words CORRECTLY in your book? Newtralisation, asid, alcali, litmas, indicater.

Do now!Can you spell the following

words CORRECTLY in your book?

Newtralisation, asid, alcali, litmas, indicater.

Last lesson

• Using Litmus as an indicator

Indicators

Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.

Litmus

Turns red in acid

Turns blue in alkali

Litmus

Turns red in acid

Turns blue in alkali

Litmus can tell us if something is an acid or an alkali, but it cannot tell us

how strong the acid or alkali is

Other indicators

We are going to investigate today whether other substances can be used as indicators

Making an Indicator

Substance Colour (neutral)

Colour with acid

(HCl)

Colour with alkali (NaOH)

A good indicator?

Red cabbage

Beetroot

Coffee

Red cake decoration

Can you quickly, quietly and sensibly gather around

Mr Porter? (You’ll need your stools)

Test!

Don’t forget you have a test Friday on

Digestion (8A)!