lesson 8 csi acids and alkalis. acids and alkalis success criteria level 5 - identify a solution as...
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Lesson 8 CSI
• Acids and alkalis
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Acids and Alkalis
Success Criteria Level 5 - Identify a solution as acid or alkali using an indicator Level 4 - Give examples of indicators that can be used to classify acids and alkalis.Level 4 - Record your results on a tableLevel 3 - Recognise common hazard symbols. Level 3 - Be able to name some common acids
Learning objective – To be able to distinguish between acids and alkalis
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Corrosive
flammable
irritant
poisonous/toxic
Match the meaning to the hazard symbol
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Names of acids
Names of acids
Citric Hydrochloric
Nitric
Sulphuric
Vinegar
Ethanoic acid
Phosphoric acid
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Some common acids
Three acids are particularly common in the laboratory .
These are strong acids that should be treated with the greatest respect.
Acid Formula
hydrochloric HCl
sulphuric H2SO4
nitric HNO3
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Indicators: acid or alkali?
An indicator is a dye which changes colour according to whether it is in an acidic or alkaline solution.
Litmus is an indicator that is red in acid and blue in alkali.
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Litmus Test
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Substance Colour change with red litmus
Colour change with blue litmus
Acid or alkali
A
B
C
Testing using litmus