I’m reading about an acid attack on a boy.

What are you reading, dad?

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What can this incident tell you about the nature of acids?

Acids can be corrosive.

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Does that mean all acids are harmful?

No. Acids are commonly found in the food we eat, such as vinegar and coke.

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What are the types of acids in coke and vinegar?

Coke contains carbonic acid whereas vinegar contains ethanoic acid.

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Come, try this lemon.

Tell me how does it taste?

How do you know those food contain acids?

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Why do lemons taste sour?

Acids have a sour taste and lemons contain

citric acid.

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But not all acids are edible, is there another way to test for acids?

Yes, we can use damp blue litmus paper to test for acids.

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The acid turned damp blue litmus paper red.

How has the acid changed the damp blue litmus paper?

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