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nvestigation of Factors Affecting the Rate ofDiffusion

In addition to the concentration gradient (i.e. the differencein the concentration of particles between two environments) thereare many other factors known to affect the rate of diffusionincluding;

temperature

the size of the diffusing particles

the viscosity of the medium through which the particles move

The purpose of this exercise is for you to work in groups todesign experiments to test two of the factors listed above. Youwill be provided with access to the materials described belowincluding;

0.5% malachite green (mw 927.1)

       1% potassiumpermanganate (mw 158.04)

       0.5% potassiumpermanganate

       1% agar plates(maximum of 2 per group)

2% agar plates (maximum of 2 per group)

plastic straws that could create uniform wells in the agar

discs of paper and forceps

pipettes (to dispense small volumes of solutions)

crushed ice and zip lock baggies

State your hypotheses and describe your experimentaldesigns in the spaces below and then discuss these with yourinstructor/TA before continuing. Be sure you haveconsidered appropriate controls, the number of replicates youintend to run and what data you are going to collect.

Hypothesis #1 (1 mark)

Experimental Design #1 (1 mark)

       

Hypothesis #2 (1 mark)

Experimental Design #2 (1 mark)