Resistance to acids

Natural and artificial fibres behave differently when in contact with strong HCl solution. The resistance to acids of petrochemical materials
is used in:
- Cloth
- Towels
- Curtains
- Bed sheets
- Equipment for chemical industries


- Cut six 2 cm strips from different cloths made with natural and artificial fibres.
Pour 5 ml strong HCl solution into each tube and drop in strips of 6 kinds of cloth.
- Place test tubes in a can of hot water and boil for 10 minutes; after that place test tubes in a stand.

Leading questions:
- How do the strips react with the HCl solution?
- Can you explain what's happening?
- Can you set up other easy experiments that show resistance to acids in action?
- Can you find applications of this property in your house or city?

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Key documents