Potato Cube Experiment
As can be seen from the results of the experiment, there is a linear relationship between the mass loss of the 1cm³ potato cube and the concentration of glucose in 500 ml aqueous solution. The greater the concentration of glucose in the solution, the greater the mass loss; for example the average mass difference of the potato cube at 15% glucose concentration was 0.080 g, while the average mass loss at a glucose concentration of 20% was 0.104 g. Very low concentrations of glucose, like during the experimental runs at 0% glucose concentration (or distilled water) and 1% glucose concentration, caused the potato cube to gain mass. In pure distilled water, the potato cubes gained an average of 0.034 g, while in 1% glucose solution; the potato cubes …show more content…
After the experiment and before the potato cubes are measured to find the mass at the end of the end of the experiment, the potato cubes are blotched with a paper tissue so that any excess water that could increase the weight of the potato is removed. The blotching was done quite irregularly and as a result, excess water on some of the potato cubes may not have been removed as much as with other potato cubes. One suggestion of improvement would be to determine a specific amount of time in which the potato cube is dried with the tissue paper. If all potato cubes are blotched for half a minute, the blotching will become much more regular and it less likely that there will be discrepancies between the mass differences due to excess water …show more content…
Glucose concentrations that are inexact affect the results, as the rate of osmosis depends on the concentration of glucose in solution and thus if the concentration is less, than the measured mass difference may be less than expected. One method of improvement would be to prepare three solutions of the glucose concentration with five trials going on in each of them and then take the mean mass difference of the fifteen potato cubes. This would ensure that the limitation from this random source of error would be kept to a minimum. However there may have also been irregularities in the composition of
Goldfish Metabolism Experiment
1468 Words | 6 PagesIntroduction Metabolism is the sum of all anabolic and catabolic reactions within a living organism to sustain life. The energy required to perform these reactions is provided by oxygen in the form of ATP, therefore the oxygen consumption rate can be measured to determine the metabolic rate. Since oxygen is obtained through respiration, the efficiency of an organism’s respiratory system affects its metabolism. Previous studies have shown that caffeine affects the human respiratory center and occasionally dilates bronchus. It can thus stimulate human respiration and increase the metabolic rate (Haggins et al, 1915).
Rhubarb Osmosis Lab Report
1127 Words | 5 PagesAdditionally, it was difficult obtaining a piece of rhubarb that was thin and particularly red, therefore the effect could not be best observed in the cells. Part B: Design your own experiment Parts of this practical were taken and slightly altered from the following link http://www.markedbyteachers.com/gcse/science/investigate-the-effect-of-surface-area-on-osmosis-in-potato-tissue.html Aim: To observe the effect different surface area: volume ratios have on osmosis in potato tissue. Hypothesis: If the potato has a larger surface area: volume ratio, the quicker osmosis will take place and the larger the mass will be at the end of the experiment, therefore the difference in mass of the potatoes from the start of the experiment to the end of the experiment will be larger. Additionally, the potato pieces left in a saltwater solution will decrease in mass, whereas the pieces left in water will increase in mass.
Mole Mass Lab Report
372 Words | 2 PagesI. Purpose: To experimentally determine the mass and the mole content of a measured sample. II. Materials: The materials used in this experiment a 50-mL beaker, 12 samples, a balance and paper towels. III.
Essay On The Effect Of Temperature On Osmosis
1159 Words | 5 PagesFor 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.
Pill Bug Experiment
151 Words | 1 PagesThe sugar used in this experiment was created by mixing ten milliliters of starch,glucose, and regular countertop sugar. This was transferred into the joint water bottle tunnel using a funnel. Both ends of the tunnel were sealed shut and each measurements were taken every three minutes and final measurements were taken after 21 minutes. The results were
Egg Osmosis Egg Lab Report
685 Words | 3 PagesThis also shows how much water was transferred from the egg to the sugar solution. The higher the percentage of corn syrup was, the faster the rate of osmosis was. As a result, the egg placed in 75% corn syrup, 25% filtered water had the lightest weight (0.5 oz), while the egg placed in 25% corn syrup, 75% filtered water weighed 2 oz. Overall, the importance of this lab was to understand the process of osmosis and how it differs depending on the type of
Sulphuric Acid Experiment
759 Words | 4 PagesA larger sample size could have enabled averages to be resulted, and the experiment could have had several trials until concordant results are attained to increase the reliability. To enhance the accuracy of the results, a machine such as a cheese wire to cut straight along the edge could have been employed that would more accurately cut the cubes and hence reducing human error. This would be efficient as there is a large chance of human error when cutting the cubes by hand as the agar is slippery. Cubes with different sizes could be observed to improve the validity of the experiment. The weight of the bottom of the cubes pushing against the beaker likely caused an error to occur.
Laboratory Report on Enzyme Activity
1407 Words | 6 Pages7. In this experiment, if the sucrose concentration were increased to 70 g/l would you expect sucrase activity to be significantly higher than the activity at 35 g/l. Explain your answer. No, because based on the results once it reached 30 g/l 35 g/l the results had stayed the same. There, the activity is lessening and coming to what looks like a plateau. 8.
Lab Report: Diffusion And Osmosis
1274 Words | 6 PagesWe then took the potato cores out of the empty beaker and dabbed them lightly with paper towel to get any excess solution off. We did this quickly and following it we then took the mass of all four potato cores again and recorded
Effect Of Surface Area To Volume Ratio On The Rate Of Diffusion
1015 Words | 5 PagesIn this practical agar jelly cubes will be used to represent a cell. AIM: To model diffusion in a practical form and investigate the effect of surface area to volume ratio. HYPOTHESIS: It is hypothesised the smaller the cube the quicker and bigger the rate of diffusion will be and with a larger cube there will be a smaller percentage of diffusion due to its bigger volume.
Potato Enzyme Lab Report
1182 Words | 5 PagesIntroduction In class, a series of experiments were performed that pertained to the enzyme known as catalase, which converts hydrogen peroxide into oxygen. Due to peroxide being toxic to the tissues of both plants and animals, both possess the enzyme catalase, which breaks into two non-toxic compounds: water and oxygen gas. Enzymes are proteins that react to certain substrates to create a product, and continue doing so afterwards. Methods and Materials To test reactions between catalase and hydrogen peroxide, groups of three to four people were formed.
Osmosis In A Potato Cell
1598 Words | 7 PagesBy 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.
Cellular Respiration In Yeast Lab Report
780 Words | 4 PagesThe Effect of Sugar Concentration on CO2 Production by Cellular Respiration in Yeast Introduction In this lab, our main focus was to find how sugar concentration affect yeast respiration rates. This was to simulate the process of cellular respiration. Cellular respiration is the process that cells use to transfer energy from the organic molecules in food to ATP (Adenosine Tri-Phosphate). Glucose, CO2, and yeast (used as a catalyst in this experiment) are a few of the many vital components that contribute to cellular respiration.
What Happens When Can Yeast Metabolize?
451 Words | 2 PagesFor example, in the response experiment, a yeast solution was prepared without sugar mistakenly and thus had to be prepared again. This suggests that other errors in preparation and measurement could have been encountered. For the future, careful measurements using clean uncontaminated flasks would eliminate possibilities of such error. A source of error for the metabolism experiment involves the yeast’s yellow hue. It is possible that the color of the yeast caused the solution to look more
Potato Osmosis Lab Report
1078 Words | 5 PagesThe percentage weight change is dependent on surface area of potato Controlled The amount of salt solution used Percentage of salt in solution Length of time the potato is sat in water Materials needed 3 Potatoes 600 ml 15% salt solution Utensils 4x 300 ml beaker Knife Cutting board Scale Ruler Procedure 1. 8 rectangular prisms will be cut from the potatoes;
More about Potato Cube Experiment
Goldfish Metabolism Experiment
1468 Words | 6 PagesRhubarb Osmosis Lab Report
1127 Words | 5 PagesMole Mass Lab Report
372 Words | 2 PagesEssay On The Effect Of Temperature On Osmosis
1159 Words | 5 PagesPill Bug Experiment
151 Words | 1 PagesEgg Osmosis Egg Lab Report
685 Words | 3 PagesSulphuric Acid Experiment
759 Words | 4 PagesLaboratory Report on Enzyme Activity
1407 Words | 6 PagesLab Report: Diffusion And Osmosis
1274 Words | 6 PagesEffect Of Surface Area To Volume Ratio On The Rate Of Diffusion
1015 Words | 5 PagesPotato Enzyme Lab Report
1182 Words | 5 PagesOsmosis In A Potato Cell
1598 Words | 7 PagesCellular Respiration In Yeast Lab Report
780 Words | 4 PagesWhat Happens When Can Yeast Metabolize?
451 Words | 2 PagesPotato Osmosis Lab Report
1078 Words | 5 Pages