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Litmus Indicator
Learning objective1. Examples of acids and alkalis2. Describe how to use litmus
indicator3. Identify acids and alkalis using
litmus indicator
What do all these things have in common?
How can you test a liquid to find if it is an acid or an alkali?
An indicator is a special chemical that changes to a different colour in an acid or an alkali.
What is an indicator?
Litmus paper and litmus solution are examples of indicators.
Red Litmus is red in acid. Blue litmus turns red in acid
Blue Litmus is blue in alkali. Red litmus turn blue in alkali
Litmus test experiment
The Litmus TestAim:
Use Litmus Paper to identify different acid, alkali and neutral solutions.
Wear goggles!
Method:• Collect your equipment.• In 9 wells of a spotting tile add one piece of red litmus paper.• To each well add 2 drops of each substance following the grid below.
• kettle descaler• tap water• battery acid• oven cleaner• kitchen surface cleaner• ammonia• shower cleaner• bleach• Vinegar
• Record the colour that the red litmus paper has changed to in your results table.
• Using a paper towel put the litmus paper in the bin. Rinse and dry the spotting tile.
• Repeat steps above using blue litmus paper.• Identify the solution as acid, alkali or neutral.
Kettle descaler Tap water Battery Acid
Oven cleanerKitchen surface cleaner
Ammonia
Shower cleaner Bleach Vinegar
Household cleaners Red litmus Blue Litmus Acid or
alkali?Kettle
DescalerOven cleaner
Shower cleaner
Tap waterKitchen surface cleanerBleach
Battery Acid
Ammonia
Vinegar
Household cleaners Red litmus Blue Litmus Acid or
alkali?Kettle
Descaler Acid
Oven cleaner AlkaliShower cleaner Acid
Tap water NeutralKitchen surface cleaner
Neutral
Bleach Alkali
Battery Acid Acid
Ammonia
Vinegar Acid