Acids and Alkalis

Are all acids dangerous??

Lemons

Are pretty good….

Everyday Acids Laboratory Acids

Are all acids dangerous??

Everyday Alkalis Laboratory Alkalis

Alkalis are another group of chemicals opposite to Acids

weakalkali

Weak acid

Strong alkali

neutralStrong acid

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Ph Scale and Universal Indicator

Stronger AlkaliStronger Acid

Name ofSubstance

Colour Change

pH Acid, Alkali or Neutral?

Orange juice Light Yellow 4 Weak Acid

weakalkali

Weak acid

Strong alkali

neutralStrong acid

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Experiment to investigate the pH of different household items

Cancelling out acids and alkalis -Neutralisation

By mixing an acid solution with an alkali solution in the correct amount, we can cancel them out.

The solution formed is neutral. (It has a pH of 7.)When we cancel out an acid and alkali like this, we neutralise them. This is called neutralisation.

ACID + ALKALI = NEUTRAL

Make your own pH scale

Colour your pH scale in correctly

Cut Out the Labels and stick next to the correct pH Value

weakalkali

Weak acid

Strong alkali

neutralStrong acid

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• You will be given a team name, nominate one person to be the spokesperson

• When you have discussed the answer as a team the spokesperson puts the team name up

• The winning team gets a prize!!!!!!!!!