Osmosis is one of the most important regulators in the body. Osmosis regulates solvents through a semipermeable membrane from a less concentrated solution into a more concentrated one, creating equal concentration in and out of the cell. For the purpose of this laboratory a dialysis bag will be used to imitate the semipermeable membrane of a cell. The dialysis bags will be filled with different concentrations of sucrose and placed in distilled water to mimic osmosis. With the dependent variable being the mass of the bag and the independent variable being the sucrose. Diffusion is a process in which material spreads through a liquid or gas evening out such as spraying perfume. Osmosis, a type diffusion, is the process of the movement of water …show more content…
Fill the dialysis bag with water to test for leaks at a sink. Step 5. Using the graduated cylinder measure 10mL of the assigned Sucrose solution. Step 6. With another piece of string secure the other end with string segments. Step 7. Rinse the outside of the bag under water and slightly squeeze the dialysis bag to check for leaks. Step 8. With a paper towel once again gently, dry the outside of the dialysis bag. Step 9. Place the dialysis bag on the scale and record the initial mass in grams. Step 10. Return to designated lab station and fill the beaker with enough water to cover the dialysis bag then place the bag inside. Step 11. Set timer for 30 minutes and allow osmosis to occur. Step 12. After 30 minutes have passed remove the dialysis bag from the tap water and repeat step eight. Step 13. Precede to measuring the weight of the dialysis bag in grams once again and record the data. Step 14. Using the calculator, calculate the percentage of change by subtracting the initial mass from the final mass and multiply by 100. Step 15. Record the data and precede to repeat the steps as instructed. Step 16. Finally share and collect class data to compare accurate change of mass. Data Chart 1: Weight Change of Dialysis Bags in …show more content…
It can be concluded that the dialysis tube was hypotonic due to more water entering the dialysis tube from the sucrose solution because how osmosis affects water. Water is attracted to the lowest concentrations of solutions and inside the dialysis tube was the lowest concentration. The dialysis tube allowed more later to enter causing a change in weight. A positive correlation is clearly shown, as the molar solution increased so did the mass of the dialysis bags. Group one were assigned tap water had a 2% increase in the weight of the dialysis bag. Groups two (.2M Sucrose solution), three (.4M Sucrose solution), four (.5M Sucrose solution), five (.6M Sucrose solution), group six (.8M Sucrose solution), and group 7(1M Sucrose solution) had increases of 10%, 12%, 7%, 13%, 11%, and 17% in weight. Blunders An example of a blunders that might occurred include breaking glass and ripping the dialysis segments. The possibilities of human errors are also present in this experiment such as not adding enough water in the beaker or not securing the dialysis bag. Instrumental limitations include incorrectly measuring the sucrose solution and weight of the of each aspect. Errors due to external influences were present in this experiment; there should have not been any growth in the tap water dialysis bag but, there was due to something out of the control of the
Coursework Equipment List • Boiling tubes (8) I will use these because this is where I will mix both the sodium carbonate and the strontium nitrate in order to form the precipitate. I need 8 because I am going to add 8 different amounts of strontium nitrate (1-8cm³) to the 8cm³of sodium carbonate. • Measuring cylinder (1) I will use this to measure the 8cm³ of sodium carbonate and the varying amounts of strontium nitrate to put into the test tubes. • Sodium Carbonate (enough to fill 8 boiling tubes with 8cm³/64cm³)
Compare the result to the chart on the back of the urinary pH test strips bottle, and record data. Clean the stirring rod with water before moving on to the next test tube. Repeat this process for each increment (2 mL, 3mL, 4mL) Figure #1: Picture of bean solution mixed Figure #2: Picture of materials needed for the with alpha galactosidase experiment Safety considerations: Be careful with the beakers, glass stirring rod, and test tubes, as they could break easily and can cause cuts in the skin. DCP: A scatter plot will be used to display how the amount of alpha galactosidase (measured in mL) in the bean solution affects the glucose concentration (measured in mg/dL) and error bars to show the standard deviation.
In conclusion, the objective of the experiment was met since the process of osmosis was observed and
This is the most accurate way to determine if the patient is retaining or losing fluid Strictly record Intake and Output Patient may develop dehydration due to all the water shifting to the interstitial spaces Maintain vascular volume Administer either D5W or hypertonic saline solution in order to pull fluids back into the vascular compartment. With lactic acidosis, lactated-ringers may be contraindicated.
Tube 1 had 1 drop, tube 2 had 2, and each tube after had an additional drop until tube 5. Next, deionized water was placed in each tube. Tube one had 4 drops; tube 2 had 3 drops and the pattern continued until tube 5. After each tube was filled with the glucose and deionized water, the contents were mixed and centrifuged. After the tubes were centrifuged, any pellets formed during the process were removed.
For this lab I will be using water and sucrose to demonstrate the rate of osmosis. In this lab I will be exploring how temperature impacts the rate of osmosis by placing pieces of potato of equal size in solutions of different temperatures and observing the change in mass of potato after a given period of time. The change in mass will indicate the rate of osmosis.
Materials and Methods The chemicals used to perform this experiment were distilled water, sodium chloride (NaCl), ice,
Step 11. Repeat steps 3-5 once with sodium chloride and then once more with urea Step 12. Replace 100 MWCO membrane with 200 MWCO membrane Step13. Repeat steps 3-5 once using glucose and once more using
Stop the timer as soon as the reaction has stopped taking place and no remaining tablet is visible. Record the data. Empty out the beaker and water. Repeat steps 18-26 three more times, until four trials have been completed in total.
On the side of each cup, write your name using a permanent marker. Mark one cup for tap water and the other for distilled water. 3. Find the mass of each bear using a balance. Record the data in the data table.
By using the same mass of potato slices and putting them in different concentration of solutions for a specific amount of time will tell us how the concentration changes the mass of the potato slice. Therefore changing the rate of osmosis. Hypothesis: I predict that, if the piece of potato was put into a solution that has a high concretion of sucrose then the potato slice would lose mass as it would lose water from its cells because the water is moving out of the cell from a high concentration to a low concentration of water through a semi- permeable membrane. The cell is hypotonic and the solution is hypertonic.
The main system concerned in this case study is the urinary system. The urinary system consists of the kidneys, bladder, ureters and urethra (“Urinary system & how it works”, 2006). This system functions as an excretory system, regulating fluid in the body as well as homeostatic balance (McLafferty, Johnstone, Hendry & Farley, 2014). Normally the urinary system starts off with the kidneys producing urine that contains metabolic waste including urea and uric acid. This urine is then sent to the bladder via two ureters.
Biology Design Practical Joshua Edwards What are effects of the volume of a potato and the amount of weight it loses when placed in salt solution? Introduction This design practical uses a potato’s surface area to volume ratio to see what affects it has on osmosis in different concentrations. Osmosis is the movement of water molecules through a cell membrane into an area of a higher solute concentration. The movement goes the way of the solvent with more solute because the lower solute concentration is drifting through balancing the ratio of solute per solvent (En.wikipedia.org, 2018).
The chemical equation for this experiment is hydrochloric acid + sodium thiosulphate + deionised water (ranging from 25ml to 0ml in 5ml intervals) sodium chloride + deionised water (ranging from 25ml to 0ml in 5ml intervals) + sulphur dioxide + sulphur. As a scientific equation, this would be written out as, NA2S2O3 + 2HCL + H2O (ranging from 25ml to 0ml in
This experiment is to investigate the relationship between solute concentration and the movement of water through semipermeable membrane by the process of osmosis. The purpose of this The Visking tubing apparatus establishes the osmosis procedure. The Visking tubing is a semipermeable membrane filled up with concentrated sucrose solution. The surface of the semipermeable membrane symbolizes the visking tubes and the mixture demonstrates the cytoplasm. If the Visking tube is absorbed in water, after a period of time, it will be have water inside water, this is because the water molecules can pass through the tubing, while the larger sugar molecules cannot diffuse out from the tubing because the size of sugar molecules do not allow it to go through the tubing.