Diffusion on a Liquid in a Liquid

Certain substances are able to diffuse across plasma membranes under the right conditions through selective permeability. The selection of these certain substances allows for cells to maintain homeostasis, as these substances move from higher concentration to lower concentration. The purpose of this experiment is to see whether or not Lugol’s will be able to diffuse across dialysis tubing, which acts as a membrane. Lugol’s turns black when it interacts with starch, which will make the diffusion easy to see. This is all based off of a caterpillar eating a plant. The starch present in the leaves causes the caterpillar to produce amylase, which breaks down starch. In one experiment, the tubing will contain starch and amylase, while the other tubing

3. Does the rate of diffusion change over time? How might this affect your calculated diffusion

My prediction is that as the concentration increases, the potato cell will lose more weight. This is because of the osmosis of water particles from the potato cell cytoplasm to the solution, resulting in a loss of weight. As the concentration decreases, the potato will lose less weight until a certain point where the osmosis of particles in and out of the potato cells will be equal. I also predict that as the salt

Purpose: To determine the concentration of solute in the potato’s cytoplasm by measuring the change

Two variables that affect the rate of diffusion are the MWCO membrane and the solute concentration. Increasing the membrane size and solute concentration will also increase the average diffusion rate. Decreasing the membrane size and solute concentration will reduce diffusion rates and can even prevent all diffusion.

7. Explain how incubation plant tissues in a series of dilutions of sucrose can give an

The results showed the molarity of the NaOH solution. This experiment was completed twice and a new average molarity

For our lab, we have six beakers of water. Three of the beakers contain high temperature water that range from 46 ℃ to 55 ℃, while the other three beakers contain room temperature water that range from 22 ℃ to 23 ℃. Then, we take six different colored Alka Seltzer tablets, and place them into the beakers one at a time. We record the length of time it takes for each Alka Seltzer to dissolve

There were several steps completed to prepare for the experiment. Three dialysis tubes were filled with approximately the same volume of distilled water and then were tied shut. The initial mass (in grams) of the tubes was taken using a triple beam scale. I then filled three 500 mL beakers with 400 mL of water each and dissolved different masses of solute (table sugar) in each beaker in order to make 5%, 10%, and 20% solutions. The beakers were labeled accordingly, and then 20 g, 40 g, and 80 g (respectively) of table sugar was weighed out using a digital scale and placed into the corresponding beakers. The sugar was stirred in using a stirring rod until all of the solute was completely dissolved.

The dependent variable in this experiment is the diffusion rate of blood spatter on every surface, measured in millimeters. The independent variable in this experiment is the different surfaces being tested on. The control is a spherical droplet, dropped at a perpendicular angle (90 degrees) creating a circular stain that is used to compare with the other trials. The constants in the experiment are height(3 ft, 90 degrees), amount of liquid

In Figure 3.1 where the partial rates of diffusion of each substance was plotted at a three-minute intervaland also in Figure 3.2 where the comparisons are seen, Potassium Permanganate increased after three minutes ahead and remained its value until the sixth minute and it remained constant, Potassium Dichromate increased at the sixth minute and retained its increase until the ninth minute and then remained constant, while Methylene blue remained constant all throughout in the 30 minutes span of time. Although the average rate of diffusion calculated in Table 2 show no difference in Potassium Permanganate and Potassium Dichromate, as seen in Figure 3.1 and Figure 3.2, Potassium Permanganate diffused the faster in the first six minutes of diffusion than

Firstly, if we consider the data collected in tables from my primary and secondary evidence, we can see that the values of the range of diffusion reaction are higher when the concentration of food colouring dye used is higher in percentage. Specifically, when the concentration is at 0%, there is no diffusion reaction at all. In contrast, as we increase the percentage of food dye used by a specific set value (+20% each time) the distance (radius or diameter) of food dye formed from diffusion around the well becomes steeper.

Diffusion is the transfer of molecules from an area that has a higher concentration to an area that has a lower concentration. Osmosis is the diffusion of water. The purpose of this experiment was to study the process of osmosis. In order to test osmosis, eggs that had been soaking in vinegar were taken and placed in four beakers of solution with different levels of glucose. Using this experiment we were able to determine the rate of osmosis of different solutions, with various amounts of glucose, through eggs. In the results of this lab it was found that the eggs were either hypertonic or hypotonic and that the

The aim of this experiment is to observe and record the rate of the blue water in the dialysis tube diffusing into the beaker containing different concentrations of salt over 20 minutes to see what effect the concentrations of salt has on the rate of diffusion. The hypothesized of this experiment is that the blue water in dialysis tube 3 will have a faster rate of blue dye diffusing into the salt water in beaker 3. Beaker 1 will have the slowest rate of blue dye diffusing from the dialysis tube into the salt water and beaker 2 will result in a colour in-between beaker 1 and 3. This is because the concentration of salt in the beaker is higher than the water in the dialysis tubes so the salt water will go into the dialysis tube while the blue water in the dialysis tube will diffusion into the beaker. This experiment was performed by measuring out the same amount of water into each of the 3 beakers and adding different amounts of salt to each one to change the concentration. 3 dialysis tubes containing water and 3 drops of blue dye were tied at one end, then tied at the other using cotton thread before placing them one each into the different concentrated beaker cotton tied end facing down. After 20 minutes the results were observed and recorded into the results table. The finishing results were unexpected and not accurate due to the systematic and random errors, rejecting the hypothesis.

another location. There are several types of diffusion that can occur. According to The Human Mosaic there are five types of diffusion that can occur. The first type of diffusion that occurs is