Investigating the relationship between diffusion and Size of the Cell

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Investigating the relationship between diffusion and Size of the Cell

Aim: To confirm the relationship that diffusion of chemicals depends on the ratio of surface area: volume.

Hypothesis: I believe that the rate of diffusion will decrease with the increase in the volume of the cell.

Fair Test:

  • Two agar cubes were used for each of the two volumes so that more accurate results could have been obtained.
  • All agar cubes were of the same size, this was done by using a ruler when cutting the agar.
  • All jelly samples were taken from one whole jelly container so the cells will be similar and the depth would remain the same.
  • The temperature will remain the same for all beakers.

Safe Test:

  • We will be using scalpel to cut the jelly therefore we made sure we handled them with care
  • We made sure we used the beakers appropriately, so that they did not brake and cause any damage.
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Variables: Independent- size of the agar cube

              Dependent   - Time taken for diffusion

             Controlled:-  

     -    Room Temperature

  • Concentration of the Acid
  • The amount of acid

Apparatus:

  1. Jelly ( Agar in big Petri dish with phenolphthalein in it)
  2. Two small Petri-dishes
  3. Scalpel
  4. Plastic ruler 15cm
  5. Stop watch
  6.  Four Beakers
  7. 0.1 m of hydrochloric acid

Method:

  1. Obtain the Agar that is in the Petri dish.
  2. Using the plastic ruler and the scalpel cut out two agar cubes of 1cm by ...

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