Determining the osmotic concentration of solutes in living plants cells using potato cores. The experiment was designed to test the number of solutes available in living plant cells at different salt concentrations to determine the tonicity of each solution. This was tested by placing five equally sized potatoes in to five separate salt solutions varying in salt concentration for 20 mins. It is believed that the solution with the highest amount of salt will have the biggest difference in mass. By measuring the initial and final weight it was determined that the salt solution with the least amount of salt solution had the biggest change in mass. Osmosis is one of the ways cells take in water which helps with photosynthesis and the general upkeep …show more content…
The materials used in this lab were 5 clear plastic cups, a beaker of distilled water, a marker, 5 potato cores of equal size, an electronic scale, different concentrations of salt concentrations (0%, 0.9%, 5%, 10%, 15%), and paper towels. Begin by labeling each of the plastic cups with the different amounts of salt concentration. Pour the same amount of solution into the designated cup. Zero out the scale then began measuring the initial weight of each of the potato cores record the data in a chart. Locate and set the timer for 20 minutes. After all initial weights are recorded place a single potato core into each cup and begin the timer. When the time is up remove each core and place it on a paper towel in front of the cup with its solution. To remove any excess water on the top and bottom lightly pat the core. Don’t squeeze the potato cores. Place each potato core on the weight separately and record its data. Determine the difference in potato core mass by subtracting the final weight from the initial weight and record it in the chart. Finally based on the difference determine the tonicity of each solution. Once all data has been collected begin to dispose of and clean up after the
This weight was recorded to four significant figures. After this, piece of magnesium was wrapped around the tip of copper wire. Following this, the buret was filled with about 10.0 mL of concentrated HCL and water was added until the buret was full. The copper wire with the magnesium was then putted into the buret and held in place with the rubber-stopper to make sure the copper wire wouldn't fall to the bottom. Distilled water was pure into the rubber-stopper to make sure the buret was completely filled and to make sure there wouldn't be any bubble.
(Exactly half) 8. The next step is to take the potato chips and weight the mass of the potato chips, use a balance for this. 9. Remember that all of the potato chips need to have a 0.1g difference. 10.
Using a stirring rod, stir the salt with the solvent, until it becomes a solute solution. This is part of the independent variable. It will be used to bathe one of the tissues and after calculating the final mass change then it will be determined if this solution impacted the red onion cells’ osmolarity. Label this cylinder A. Procedure Firstly, cut through the middle of the red onion, creating two halves.
Objective The purpose of this lab was to demonstrate and view the osmotic process without using a microscope or chemical testing. In order to do so, background knowledge on the direction and flow of water is needed to identify the movement of osmosis. Hypothesis The hypotonic solution will cause the potato strip to become heavier relative to its previous mass, the hypertonic solution will cause a decrease in the potato strip’s mass, and the isotonic solution will result in no change in mass.
3) Distilled water was added to dissolve it. 4) The two electrodes were placed in the water while making sure that they were immersed in the solution but not touching each other or the surface of the beaker. 5) After about 10 seconds, the average of the readings were taken and recorded.
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.
Once we read, we then obtained the materials needed, which were an electrical balance, a nickel, golf ball, pencil, rock, an empty 100 ml beaker and a 100-ml beaker containing 50 ml of water. After obtaining our materials, we turned on the balance and set it to weigh in grams. Then, we "zeroed" the balance and began placing each object on the balance. While placing each object on the balance, our lab partner, Sandra recorded the weights. Eventually, we finishing weighing each object, recording their weights and then we began converting the recorded measurements to the English system and calculating the density.
The lab will be focusing on finding how much sodium in the water is equal to the amount of sodium in the potato cell. Sodium is a mineral found naturally in many foods, including fruits and vegetables. Your body needs some sodium to balance the amount of water in your cells and stimulate the production of nerve impulses and muscle contractions (HealthyEating.sfagte). An average potato weighs around 213 grams, and is a vegetable which is rare in sodium. About 1-3 percent of the potato is considered pure sodium which can also be a positive aspect to this experiment, knowing the fact that sodium is one of the solutes in an average potato.
Analysis The lab conducted was able to demonstrate the basic concept of cellular reputation by observing germinating peas and non-germinating acrylic beads. As time progressed, the overall volume of the germinating peas continued to decrease while the acrylic beads remained relatively constant. After thirty minutes, the volume of the peas went from 7.75 mL to 6.00 mL, a difference of 1.75 mL. However at the same time, the acrylic beads went from 8.25 mL to 8.00 mL, a mere 0.25 mL difference. While the germinating peas produced large differences between its oxygen consumption, the beads had only slight changing intervals. This leads to conclusion that the respiration rate of the germinating peas was faster than the respiration rate of the acrylic beads.
A 2.54x2.54 cm of cold Chicken Liver was placed in a 16x100mm Test Tubes numbered 4. A 2.54x2.54 cm of warm Potato was placed in 16x100mm Test Tubes numbered 5. A 2.54x2.54 cm of cold Potato was placed in 16x100mm Test Tubes numbered 6. A 2.54x2.54 cm of warm Potato was placed in 16x100mm Test Tubes numbered 7. A 2.54x2.54 cm of cold Potato was placed in 16x100mm Test Tubes numbered 8.
In conclusion, when the concentration of grape juice increased, the average percentage change in the mass of the potato cylinders decreased. The increased concentration of grape juice means that there are more glucose molecules and, hence, the solution had a lower water concentration. There were more water molecules in the potatoes, thus diffusing into the water, against the concentration gradient in order to reach equilibrium. The water being lost decreased the mass of the potato cylinders. For example, in my raw data, concentration of grape juice solution of 40%, the initial weight of the potato was 6.00g however, after 15mins the weight of the potato decreased to 5.63g henceforth, the potato lost 0.37g.
Ensure that each and every potato has the same mass in this case 2 grams. 5. Repeat step 1-4 but using King Edward potatoes instead of Baked Potato. 6. Label each beaker with the sucrose concentration.
The mass of the before the experiment was ranged from 8.520 g to 18.46g. The weight between each of the potato was different because our goal was to find the percent change in mass, which made the mass of the potato don’t have to be the same. The mass after the experiment was ranged from 7.280g to 15.05g. We could tell the solution concentration in 0.0M, and 0.2M make the potato’s mass increased which making the potato hypotonic. The mass decreased in the solutions of 0.4M, 0.6M, 0.8M, and 1M making them hypertonic.
a. Our assessments align with the Science Grade level Expectations. The standards followed for this assessment were: 7.Sci7Inquiry.1A.a Formulate testable questions and hypotheses 7.Sci7Inquiry.1A.c Design and conduct a valid experiment 7.Sci7Inquiry.1B.b Determine the appropriate tools and techniques to collect data 7.Sci7Inquiry.1B.c Use a variety of tools and equipment to gather data (e.g., microscopes, thermometers, analog and digital meters, computers, spring scales, balances, metric rulers, graduated cylinders, stopwatches) 7.Sci7Inquiry.1C.a Use quantitative and qualitative data as support for reasonable explanations (conclusions) 7.Sci7Inquiry.1D.a Communicate the procedures and results of investigations and explanations through: oral presentations, drawings and maps, data tables (allowing for the recording and analysis of data relevant to the experiment, such as independent and dependent variables, multiple trials, beginning and ending times or temperatures, derived quantities), graphs (bar, single line, pictograph),equations and writings Based on these standards, the learning goal for this unit is, “the student will be able to design valid experiments,” and the learning target is, “I can conduct valid experiments.” Lessons taught prior to this assessment were used to prepare students for this unit assessment, the benchmark assessment, and will become the
Name: Simon Lau An Investigation to find out how the Concentration of a Salt Solution will affect the mass of a Potato Investigation Background Information: In this investigation we are going to see how osmosis occurs in a potato and affects the mass by reducing or adding onto it. Osmosis is the diffusion of water between a semi-permeable membrane from a higher concentration to a lower concentration. Variables that can be explored in this investigation is how the concentration of salt solution could affect the mass as well as how the size of potato could affect the mass.