Effect of size on uptake by diffusion

Effect of size on uptake by diffusion :                            HazCard:

• 100cc beaker

• White tile

• knifes

• Paper towel

• Ruler

• Tweezers

• Stop-clocks

• HCl 0.1 M /1M/2M 

• Agar cubes 2X3X2 1 per group

• Agar cubes 1X3X1 1 per group

• Agar cubes 0.5X3X0.5 1 per group

  • •  To make good solid agar, stir 2 g of plain (technical) agar powder into 100 cm3 of water. Heat, in an aluminium water bath filled with boiling water, with stirring, until the agar solution boils, then allow to cool. Make the agar blocks in straight-sided dishes or ice cube trays. If students cut cubes themselves, each group will need a block 2 cm x 3 cm x 2 cm. If you have chosen to use hydrochloric acid to soak the cubes, make up the agar with 0.01 M sodium hydroxide and colour the agar with universal indicator (Hazcard 31, Recipe card 36) or phenolphthalein (Note 2). 

    • Sodium Hydroxide 0.01M To make Agar

    • UI To colour agar