The Effect of Salt Concentration on Osmosis in Potato

1183 Words Sep 14th, 2011 5 Pages
Part A:
Title: Diffusion
Diffusion is the spontaneous movement of particles from where they are more concentrated to where they are less concentrated. For this experiment, a 14 cm glass was filled with cold tap water. A drop of red food coloring was dropped in the cup. A stopwatch was used to measure the time it took for the food coloring to get to the bottom of the cup. The average diffusion rate was .78 cm a second. If a different color was used, I do not think it would have made a difference in the results. The mood of the person experimenting could possibly alter the results. For example, if a person is under stress, they may accidentally squeeze too much altering the rate of diffusion. If the water was warmer, this may have sped the
…show more content…
You should consider each of the four solutions and explain what happened using the terms "hypertonic" "hypotonic" and "isotonic." In osmosis, the flow of the water from or to a cell depends on whether the cell is immersed in a solution that is isotonic, hypotonic, or hypertonic to the solution. If the cell is isotonic to a solution, this means that the solute concentration of a cell and its environment is the same and therefore there will be no movement of water. If the solute concentration is lower than that of the cell, then water will flow into the cell, causing it to expand. If the solute concentration is lower than that of the cell then water will flow out of the cell, causing it to shrink. 2. Were your hypotheses right or wrong? Tell how those hypotheses would have to be modified in another experiment. My hypotheses were correct. 3. What mistakes (uncontrolled variables) might have affected how the results came out. Suggestion: Think of all the places in your method and materials where accuracy may not have been the best. Describe several. There could have been several variables that could have affected the results of this lab. One would have been if the salt measurements were incorrect. If more or less salt was added than realized, this would have caused the results to be incorrect. Another variable could have been the size of the potatoes being measured incorrectly. If
Open Document