09/10/2013 · Osmosis Lab Report (1) ..

Osmosis lab report - SlideShare
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The impact of temperature on osmotic rates - …

Our results were inconsistent with predictions. Although temperature did have a significant influence on the percent change in mass, it was not a linear relationship as we had hypothesized. The percent change in mass was highest at the normal temperature with averages of about 14% and 22%, but was lower at the cold and hot temperatures. There was an increase in percent change in mass from cold to normal temperature, but then the percent change in mass suddenly dropped off at the hot temperature with changes in mass close to 0. We concluded that this sudden drop off at the hot temperature was caused by the potato pieces being overheated, causing the enzymes to denature, and damaging the cells of the potato pieces. Since the patterns at the cooler temperatures did look like we had expected, we infer that had we included additional temperatures below those that cause damage to the potato, we would have been able to show a more linear relationship. We found no other similar studies on the CABLE web page. From the results of our experiment we propose an alternative hypothesis. Perhaps osmosis increases linearly with increasing temperature, to a point at which enzymes denature, and the cells in the potato become damaged. To test this alternative hypothesis we would conduct a similar experiment increasing the number of data points we have by using additional temperatures in increasing order with our highest temperature being below the hot temperature that we had used in this experiment. This way we would have sufficient data to show a linear relationship with increasing temperature, and we could see the point at which the damaging of the potato cells begins to take place, causing the linear relationship between osmosis and temperature to end.

answer the question does temperature affect the amount of osmosis? The hypothesis predicted was that the higher the temperature the more osmosis would
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02/01/2018 · The impact of temperature on osmotic ..

We tested the effects that different temperatures have on the rates of osmosis in potato pieces. It is known that chemical activity is positively correlated with temperature (Campbell, 2002); therefore molecules in a substance are expected to move faster as temperature increases. This principle should apply to osmosis, and molecules are expected to move from one side of a membrane to the other side at a faster rate as temperature is increased. Since these molecules are moving across the membrane more rapidly, we hypothesized that the rate of osmosis will linearly increase with temperature.

I am sure students now understand how to write a potato osmosis lab report ..
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To test this hypothesis we measured osmosis in potatoes as the change in mass after being submerged in fresh water and salt water (0.5 M) at three temperatures for 35 minutes. We weighed 24 pieces of potato before and after soaking in solution and then calculated the % change in mass as a proxy for osmosis. We predicted that the cold environment would have the lowest percent change in mass, and the hot environment would have the highest percent change in mass.

Marc Garneau Collegiate Institute
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