Investigating Osmosis :: Papers

Investigating Osmosis Aim To find out how osmosis affects the mass of a chip through different sugar solutions. Apparatus Petri dishes (6) Chips Ruler Thermometer 30 cm3 Solutions (6) DI, 0.2, 0.4, 0.6, 0.8, 1M Measuring Cylinder Knife Weighing scales Definition Osmosis is the movement of water molecules from a high concentration of water molecules to a lower concentration of water molecules through a semi-permeable membrane. Prelims Before doing this practical, I did a preliminary experiment. This was to help with my prediction and also to improve my main practical. This experiment was quick. It was just the same as the actual practical but it helped me to change certain things. I recorded 3 different changes in mass of the chips in each of the solutions at different times. DI 0.2 m 0.4 m 0.6 m 0.8 m 1m 4cm 4cm 4cm 4cm 4cm 4cm 1 hour 4cm 4cm 4cm 4cm 4cm 4cm 1 1/2 hours 4.1cm 4cm 4cm 3.8cm 3.8cm 3.6cm 2 hours 4 cm 3.9cm 3.5cm 3.6cm 3.4cm 3.2cm I’ve now decided to weigh the chips at the start and finish. This is to get more accurate readings. It will be easier to spot any anomalous results if one chip is compared to two others. I have decided to leave the chips in the solution for a longer period of time (overnight) I found that the longer I left the chips in the solution the more the mass changed. I did this to get more accurate results. Variables The only thing verifying in this experiment is going to be the concentration of the sugar in each of the solutions in the 6 different