Activities | Chemistry and Biotechnology

Rubber balls

Materials:

• 1 large cup
• 1 cup
• Borax (sodium tetra borate, Na2B4O7·10H2O)
• white glue
• colouring
• water

Preparation:

1. Pour 50 ml of water into the cup.

2. Pour the same amount of glue into the cup and add a few drops of colouring.

3. Stir well, add the borax solution (previously prepared in the proportion of 1 dessert spoon to 100 ml of water). Add the mixture and remove the solid part.

4. Squeeze the mixture into a ball with your hands


Activity instructors: Isabel Silva, Sofia Duarte (Lab.EQ - Chemical Engineering Lab)