Discussion: The rate of osmosis decreased as the concentration increased. This is because the egg began with a certain solute concentration and was placed in the distilled water with zero salt concentration, the rate of osmosis into the egg was highest here as it was the largest concentration gradient from the egg to the solution. Therefore the water molecules diffused into the egg through the membrane as moving against the concentration gradient from low to high concentration. As the egg moved into the next solution of higher concentration there was a slower rate of osmosis due to the increase in solute concentration and therefore a lower concentration gradient however there is still an overall net movement of water into the egg. The rate …show more content…
There is also a small standard error of the mean compared to the size of the standard deviation which indicates some uncertainty in the accuracy of the results. The concentrated solutions used may have been contaminated from the source and therefore all collaborated results would be inaccurate due to the solutions not being of the correct percentage concentration of sodium chloride. The results would be inaccurate as they would not be correctly collaborated to the correct concentration in which they are being graphed for. Another systematic error is that the eggs are not all exactly the same size and effects such as surface area to volume ratio can impact how much water enters or exits the egg at any point in time. There was also still traces of shell left on some eggs which would have affected the rate of osmosis as not all membrane was available to be utilised in the diffusion of water. However, a larger sample size will eliminate the effect of this error. The reaction may have not reached equilibrium in the time frame of 10 minutes and this may be needing to be extended. For an equilibrium to be reached between the water and solute in the egg and in the solution. The strength of the experiment included the efficiency in which the practical was completed placing 2 eggs within a solution each at the one time as well as collaborating results with other experimenters in order to achieve an average overall for a larger sample size. Yet it could still be improved by further increasing the sample size of the experiment to counteract and possibly eliminate the effects of errors on the
The process of osmosis changes the volume of water in a cell which changes the size of the cell. The vinegar and distilled water were both hypotonic solutions, so water was added to the egg. As a result of more water entering the egg, the egg would expand. The volume of water in the egg increased, causing the size of the egg to expand as well. The corn syrup was the only hypertonic solution because water moved from the egg, to the solution (corn syrup). This type of solution caused the egg to shrink because water was being taken out, or moved, into the solution. The volume of water in the egg decreased, causing the size of the egg to
In the beginning of the experiment, the untouched egg weighed 56.7 grams, but after being submerged into vinegar, the egg weighed 65.6 grams. The egg had a 15.7% increase in mass from the original, untouched egg to vinegar. Water went into the egg making it a hypotonic solution. The egg was more concentrated than the solute, so the water moved into the egg until it reached osmotic balance. We observed that the egg, that used to have a hard, white shell
The purpose of this lab was to show us what will happen when we soak the egg in the tap water overnight. When we soaked the egg in the tap water overnight, the egg appeared to be swollen. The egg also gained mass because the egg has less water concentration.
Following directions, paying attention, and being careful were the harder tasks. Before one starts any experiment, it is important to always be cautious and use safety first. Even though Professor Demor gave each of the eleven groups an opportunity to create their own experiment, there were specific rules each of us were still required to follow. Each group was required to use a minimum of ten duckweed plants. We were also required to use a maximum of 50 ml of solution of our choice. Lastly, professor gave us a maximum of nine cups for replication. We did not have to use all nine, it was up to us. Every group was different, but this is what our group experimented. Our group decided to see what effect high phosphate and nitrogen levels had on the growth of duckweed. The phosphate level was 100 ppm and the nitrogen level was 1760 ppm. As a group we set up three replicas cups with 50 ml of solution and one cup with 50 ml of regular pond water. After filling the cups with the right amount of solution, we took the duckweed out of the original container, using a _________ and placed it into the proper cups. In order to see a major difference amongst duckweed growth, we used 10 duckweed plants per cup, most having only 1-3 fronds. After that, we labeled the cups properly. To stop contamination, all cups were covered with plastic wrap and was securely held down with a rubber band. Lastly, once everyone finished, we were asked to place
In this lab there were many opportunities that an error could have occurred and skewed the data. One such error could be in the difference in temperature for trials 1 and 2. Although there was a short window between the trials for the Borax solution in an ice bath, but in this time the temperature could have changed a couple of degrees.
In conclusion, the title and context of the article are clear, and appropriately match the hypothesis of the authors. There is consistency between the objective of the experiment and its relationship to science. This writer found some issues in the overall presentation of information, in that the text lacks smooth transition, and was difficult to read and follow.
Osmosis and diffusion are two methods which work towards levelling the concentration in the two given surfaces – the cell and the environment. Purchon defines osmosis as the movement of water from a higher concentration to a lower concentration “through a semi permeable membrane”. For instance; a red blood cell when placed in a hypertonic solution undergoes crenation as water from cell moves down the concentration gradient into the environment. Osmosis is only for water molecules while the similar movements of other particles down their concentration gradient is known as diffusion. Diffusion can happen in various mediums such as liquid and air. For example, the cologne particles when released, diffuses through the air. It is necessary to understand the purpose of osmosis and diffusion to get an idea about the importance of homeostasis in our body and how the organs systems work towards
This means that in 0.15M solution, the cytoplasm of the potato cells are isotonic to the solution so the net movement of water between the two is equivalent. One possible source of error in this lab is that I did not pour the correct solution into each cup at first so my partner and I had to dump them out and restart. However, each cup already had a potato core in it at the time of the incident so the potato cells might have gained or lost some water before they were placed in the correct solution and this would have affected their changes in mass. Also, since the cups were stored next to a window during the lab, they were exposed to sunlight which could have caused some of the water in the solutions to evaporate. With less solvent, the solutions became more concentrated and hypertonic which would have caused larger decreases in the potato cores’ mass. One way to build off of this lab in the future is by replacing sucrose with salt or a different solute in the solutions and then comparing the effects on the potatoes’
Every living organism’s salt content is controlled by osmosis. Through osmosis, water moves across an organism’s surface and/or membrane. Osmosis usually moves from high concentration to low concentration. In this experiment we decided to add 300mL of water in 2 jars labeled a Jar A was filled with freshwater while Jar B was created into a saltwater solution. After we added a 1 piece of each of our vegetables which were (carrot, celery and raisin). After we added the vegetables we added cling wrap to each of our jars so the water doesn't evaporate and turn into water vapor. In groups we had to figure out what happens to the vegetables before and after 24 hours in the saltwater, and the freshwater. Vegetables such as carrots
This lab demonstrates one type of molecular movement, passive transports, displays the effects solutions have on a cell, a chemical reaction, and how the cell membrane works.
The steeper the graph gets, faster is the change in rate. So, from the graph we can see that the rate is fastest for 0.2M because it has a greater steep, so higher rate of osmosis took place when 0.2M was placed in the solvent. On the other hand, we see a rise for 0.6M this means that the rate of osmosis was very low when 0.6M of sucrose was placed in diH2O.
Abstract: In this lab, carrots were placed in sugar solutions of varying sugar concentrations. The effects of osmosis and cellular diffusion are going to be observed as the carrots gain or lose weight in the solutions over the period of time. The weights of the carrots will be measured after 30 min, and again after 24 hrs. The purpose of this lab is to find out how the cells in carrots will react to various sugar concentrations. The idea is that the cells will absorb the water and become heavier and supple.
There are some sources of error affecting the experiment results and the corresponding ways of improvement.
For my egg drop project, it was pretty challenging trying to find a format structure to protect the egg from cracking. Finally I figured out one that was good enough to keep the egg in or so I thought.
The objective of the experiment was to change the large oval cups liquid from the color dark navy blue to dark yellow. The hypothesis that was made is “if unicellular organisms can breathe, then cellular respiration can happen”. Data that has been collected during this experiment shows that unicellular organisms can breath and cellular respiration can happen in any living organism. There were no patterns of any sort during this experiment. Also, according to the data table that yeast needs food to be alive. Errors that occurred during the experiment was mixing materials. For example, the water dropper accidentally became a mixer for the yeast. The way this problem can be fixed is to have one dropper for each liquid and keep that dropper next to that liquid. This will eliminate the mixing of liquids of any sort. Overall the findings of this experiment show that unicellular organisms can breath and cellular respiration can