Osmosis

... . After 30 minutes I drained out the solutions in the sink and placed all the chips on the paper towel in the order I had put them in the test tubes as to not confuse myself as to which chip came from which solution.

10. I dried each chip with the paper towel and then placed each one on the scales so that I could weigh them.

11. Each potato was measured accurately on the electronic scales and then the weights were recorded.

12. As I had time after doing the first set of results I redid the experiment under exactly the same conditions. This gave me secondary set of results which gave me a more accurate view on the changes.

Precautions:

"h As was stated in my planning section of the coursework, I had to keep all of the different non-variables the same, to make sure that none of them affected the results of the experiment in any way. "h Whilst cutting the potato, extreme care and precision had to be taken with the scalpel as it is very sharp and could easily cause a serious wound. "h The measurements for the solutions had to be perfect as to not change the out come of the experiment. "h I had to ensure that every time I handled the potatoes my hands were clean and dry. This was to stop any kind of contamination and made sure that I did not pass on any extra water onto the potatMain Tables of Results for all Concentrations

0.00m concentration mass before (g) mass after (g) change in mass (g) % change in mass 1 1.46 1.52 0.06 4.109589041 2 1.64 1.75 0.11 6.707317073 3 1.72 1.85 0.13 7.558139535 4 1.64 1.89 0.25 15.24390244 5 1.63 1.85 0.22 13.49693252 6 1.75 1.95 0.2 11.42857143 average 1.64 1.801666667 0.161666667 9.757408672

0.25m concentration mass before (g) mass after (g) change in mass (g) % change in mass 1 1.56 1.46 -0.1 -6.4102 2 1.66 1.64 -0.02 -1.2048 3 1.6 1.61 0.01 0.625 4 1.51 1.15 -0.36 -23.841 5 1.63 1.68 0.05 3.06748 6 1.34 1.39 0.05 3.73134 average 1.55 1.48833 -0.0616 -4.0053

0.5m concentration mass before (g) mass after (g) change in mass (g) % change in mass 1 1.65 1 ...