Preview

The Effect of Solute Concentration on Osmosis in Potatoes.

Good Essays
Open Document
Open Document
943 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
The Effect of Solute Concentration on Osmosis in Potatoes.
Martina Oganesyan
Title of investigation: The effect of solute concentration on osmosis in potatoes.
Research question: What is the solute concentration of a potato?
Hypothesis:
Osmosis is the movement of water across the membrane from an area of high concentration to an area of low concentration. The osmosis continues until the solute concentrations are equal in both areas. In this experiment, we put pieces of potatoes into test tubes with sugar solutions of different concentrations and leave them there over night. It was done in order to compare the initial mass of the pieces and the ones after being placed into the solute concentration. Pieces which were placed into a hypotonic (lower) concentration of solute should increase in mass, those in hypertonic (higher) concentration should decrease in mass and the ones put into an isotonic concentration (same) should stay the same before and after. All those changes will take place because of osmosis.
Dependent variables: change in mass of pieces of potatoes.
Independent variables: solutions sucrose concentrations.
Controlled variables: amount of time in the solutions; surface area of the potato segments; diameter of the test tubes; temperature.
Material:
* 10 same size potato cubes * 10 test tubes * Sucrose (C12H22O11) * scalpel * distilled water * balance (±0.05) * test tube holder * temperature probe (±0.01) * graduated pipette (10ml±0.75) * Erlenmeyer flask (1L ± 25ml) * Thermometer

Method:
Take a potato and cut out 10 cubes using a scalpel, which are equal in size. After, 10 test tubes have to be selected for a different sugar solution concentration each, starting from 0.1 mol/l until 1.0 mol/l. First make a solution of 1mol/l using powdered sucrose (the mass needed to do so can be found using the formula n=m/M and weighed with a balance. Place the solutions into test tubes and fill with distilled water until the total volume of solute on in each test tube

You May Also Find These Documents Helpful

  • Good Essays

    1) As the Concentration of the Sucrose Solution increases, the more the potato’s mass decreases. This is due to the solution being hypotonic. So, as the solute concentration gets higher, the potato’s water concentration will get…

    • 898 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Potato Osmosis Lab Report

    • 939 Words
    • 4 Pages

    We labeled each beaker as either the water control, 0.5M sucrose, 0.1M sucrose or 0.05M sucrose. We then placed the weighing boat on the electronic balance, zeroed the balance, then placed the potato pieces until four pieces were exactly 6g and four were exactly 10g. We then filled two beakers with 100mL of water to act as the control. For the proper dilutions of 0.5M, 0.1M, and 0.05M, we respectively filled one beaker with 100mL sucrose, one beaker with 20mL sucrose and 80mL water, and the last beaker with 10mL sucrose and 90mL water. In order to properly measure the correct amount of sucrose, we used the 100mL graduated cylinder and added the calculated amount of sucrose to each water beaker. We then placed the 6g potato piece in the control, waited 30 seconds before placing the 10g potato piece in the control, waited 30 seconds before placing the 10g potato piece in the 0.5M beaker, and so on. After 10 minutes, we used the forceps to retrieve the 6g potato from the control, blotted it with a paper towel, and used the electronic balance to weigh it. We did this for each potato piece in 10 minute intervals until 60 minutes was…

    • 939 Words
    • 4 Pages
    Good Essays
  • Better Essays

    This experiment gave a visual understanding of osmosis and diffusion. The first experiment proved that solutes would move down a concentration gradient if permeable to the selective membrane. The second experiment proved different solute concentrations affect the movement of water, depending on the solute concentration inside the cell. The purpose of this lab was to look for different solutes that can cross an artificial membrane and to observe the effect of different concentrations of sucrose on the mass of a potato cell. Results for Part One suggested that the molecular weight of albumin and starch was too large to pass through the dialysis tube, but glucose and sodium sulfate molecules were small enough to pass through the dialysis tube. Also, a decrease in water weight occurred due the dialysis tube being placed in a hypertonic solution. Results for Par Two showed the potato cell having a molar concentration of 0.2734, which caused sucrose concentrations above 0.2 M to have a decrease in mass. Inversely, sucrose concentrations below 0.2 M caused an increase in mass.…

    • 2179 Words
    • 9 Pages
    Better Essays
  • Good Essays

    Potato Lab

    • 663 Words
    • 3 Pages

    The groups being testes are the hypotonic environment (water and iodine), hypertonic environment (Salt) and the control which is just the potato in just the beaker. The time the potatoes stay in each environment is 5 days. One potato is in 300mL of water and iodine solution, another is in 300mL of salt and the last potato is just in air. The potatoes are all fully peeled with no skin. The potatoes are in 3 different beakers with saran wrap over the top of each beaker.…

    • 663 Words
    • 3 Pages
    Good Essays
  • Better Essays

    As the concentration of the sucrose solution increases, the average percentage change in mass decreases in the potato tubers and this is the same as in the carrot tubers. At low concentrations of sucrose solutions (0.1 M) the mass of the carrot and potato tubers increases due to water moving into the protoplast of the cell from the sucrose solution by osmosis and at high concentrations of sucrose solutions (0.5 M) the mass of the carrot and potato tubers decreases due to water moving out of the protoplast of the cell to the sucrose solution by osmosis. At certain concentrations (0.18 M of the potato and 0.355 M for the carrot) the potato and carrot tubers don’t change in mass due to the water potential inside the cells equalling the water potential of the sucrose solution. My graph displays a distinct negative correlation; the higher the concentration of sucrose…

    • 1394 Words
    • 6 Pages
    Better Essays
  • Good Essays

    Ap Bio Lab Report Osmosis

    • 850 Words
    • 4 Pages

    When a substance is released into an area, the random movement of its molecules results in a multitude of collisions. These collisions, in turn, lead to a dispersion of the molecules. The overall movement of the molecules will be from an area of high concentration, where there will be more collisions, to areas of low concentration, where the number of collisions will be much less. This process of dispersion will continue until there is no net gain or loss of molecules in an area. The process by which this equilibrium occurs is called diffusion. Diffusion is vitally important to biology on many levels; individual cells, organelles, and even whole organisms rely on diffusion to carry out the processes essential to life. One especially important aspect of diffusion is osmosis, or the diffusion of water. This often occurs across a semi-permeable membrane…

    • 850 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    i. Obtain all necessary materials for the experiment: the assigned sucrose solution for the group (.2M, .4M, .6M or .8M), an Erlenmeyer flask and corresponding cork, one or two skinless potato cores, scale to mass potato cores, paper towels and tables to record results.…

    • 1627 Words
    • 7 Pages
    Powerful Essays
  • Good Essays

    Lab 1C - using the potato core borer, obtain 24 cylindrical slices of potato, four for each cup. Determine the mass of the four cylinders. Immerse four cylinders into each of the six beakers or cups. Let stand overnight. After time is up, remove the cores from the sucrose solutions and mass them. Record all data in its appropriate table.…

    • 2756 Words
    • 12 Pages
    Good Essays
  • Better Essays

    The way to get the full results of this lab was through the process of osmosis. Osmosis is the movement of water across a membrane into a more concentrated solution to reach an equilibrium. When regarding cells osmosis has three different terms that are used to describe their concentration. The first of these words is isotonic. Cells in an isotonic solution show that the water has no net movement and the amount of water that goes in is the same that goes out. Isotonic comes from the root iso, which means equal. This makes sense because the definition of isotonic is: same concentration. The second out of three words is hypotonic. Cells in a hypotonic solution make the water move into the cell to spread out the cells solutes to eventually reach an equillibrium. Hypotonic comes from the root word hypo, which means low/below. The actual definition for hypotonic is: less concentrated. Hypertonic is the last out of the three words. A cell in a hypertonic solution makes the water leave the cell to try to spread out the solutes outside to eventually reach an equillibrium. Hypertonic comes from the root word hyper, which means more/high. The definition of hypertonic is: more concentrated.…

    • 1415 Words
    • 5 Pages
    Better Essays
  • Powerful Essays

    OBJECTIVES: To investigate the effect of concentration of blackcurrant squash on osmosis in chipped potatoes.…

    • 2342 Words
    • 10 Pages
    Powerful Essays
  • Powerful Essays

    Potato Osmosis Lab

    • 3353 Words
    • 14 Pages

    Aim To observe and measure the effect of osmosis on the mass of potato using a starch solution. Introduction In order to measure the effect of osmosis, eighteen pieces of potato were cut and placed in six groups, each group of three pieces cut to weigh as close as possible to one another. For each potato group, a test tube was half filled with a starch solution varying in concentration from 0% (water) to 1%. Hypothesis…

    • 3353 Words
    • 14 Pages
    Powerful Essays
  • Satisfactory Essays

    Osmosis Intro

    • 500 Words
    • 2 Pages

    We soaked several discs of potato cuted using a cork borer with around 1 centimeter of diameter and 2 milimeters of lenght into sucrose solutions with a different range of concentrations from 0 to 1.0M. Then we weighed all the potato cylinders on an electronic balance (see results) and recorded the results. We placed enough pieces of potato to cover the bottom of the petri dish and left them for 60 minutes. After this time we drained out the solutions from the petri dishes and carefully placed them in order of molarity on a paper towel.…

    • 500 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    The aim of this experiment is to investigate the osmosis effect in potato cores while they are submerged in different concentrations of sucrose solution. Osmosis will take place while the potatoes are fully submerged in the sucrose solution.…

    • 385 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Potato Osmosis Lab

    • 1094 Words
    • 5 Pages

    Osmosis was clearly shown since the potato cylinders decreased or increased at different concentrations of sucrose. The results supported my hypothesis because for the 0.0 sucrose concentration the average percent change in mass was 16.9%. For the 0.2 concentration the percent change was 3.59%. For the 0.4 concentration the percent change was -15.3%. For the 0.6 concentration the percent change was -27.1%. For the 0.8 concentration the percent change was -23.2%. For the 1 concentration the percent change was -15.4%. The reason for the change in mass is the process of osmosis. When the sucrose concentration was 0, the cores gained weight because the concentration in the potato cells was different from the concentration outside, which was a hypertonic solution. When the sucrose concentration was 0.2, it was an isotonic solution, so there was no major difference in mass. When the concentrations of sucrose were higher (0.4, 0.6 and 0.8), the outside solution was hypotonic because there was a decrease in the potato…

    • 1094 Words
    • 5 Pages
    Good Essays
  • Better Essays

    Glucose Sucrose Osmolality

    • 1369 Words
    • 6 Pages

    The materials used were: two potatoes, a potato corer, a scale, and beakers of varying concentrations of solute.…

    • 1369 Words
    • 6 Pages
    Better Essays

Related Topics