Resistance to bases

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


- Cut six 2 cm strips from different cloths made of natural and artificial fibres.
- Pour 5 ml 10 % NaOH 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 NaOH solution?
- Can you explain what's happening?
- Can you set up other easy experiments that show resistance to bases in action?
- Can you find applications of this property in your house or city?

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Key documents