Investigating the Strength of Cytoplasm in Potato Cells AIM To investigate the strength of cytoplasm in potato cells. VARIABLES Strength of solution Weight of potato Length of potato Volume of solution Temperature of the room Type of potato Size of potato WHAT I ALREADY KNOW I know that osmosis is when water molecules move from a weak solution to a strong solution through a semi-permeable membrane. PREDICTIONS I predict that the stronger the salt solution is the more likely the potato will weigh less than what it did at the start of the experiment. APPARATUS AND MATERIALS Potato Stop clock Boiling tubes (100ml, 10ml) Salt solutions of various strengths A balance Test tubes Test tube holders A scalpel A teat pipette DIAGRAM PLAN I will get 5 test tubes and place them into the test tube rack. I will then cut up 5 pieces of potato and weigh them to make sure they all weigh the same weight to make the test fair. To make the 1% solution you have 50ml of 2% salt solution already made by the teacher and 50ml of water, shake the boiling tube up and pour some into the smaller boiling tube up to 10ml. I will repeat this process to make 0.5%, 0.4% and 0.2% in a similar way. I will put each piece of potato into the 5 test tubes and add the 10ml of 2% solution in one test tube, 10ml of 1% solution into another test tube, 10ml of 0.5% solution in another, 10ml of 0.4% in another and 10ml of 0.2% into another test tube. I will then leave all 5 test tubes for 25 minutes because that will be all the time left in the lesson as the 35 minutes of the beginning of the lesson will be setting everything up. At the end of the experiment I will clean up and carefully dry the
5. A second test tube was then filled with water and placed in a test
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
Put a label on each test tube. With a pencil, number each test tube from one to twelve.
· Repeat each test three times so that we gat a reasonable result and in the case of getting a ‘freak’ result I will repeat that test.
We then cut our potato tubes with the cork borer and cut them with the scalpel so they were the same length and weighed them. We then put one potato tube in each test tube and then added the same amount sugar solution in to each tube. The concentration of sugar solutions varied in each test tube.
· Collect 3 cylinders, and then cut them into 6 pieces of 3 cm with a
Osmosis Investigation We are trying to find out what the concentration of the solution is inside the vacuole of a potato cell. We will investigate how the mass of the potato chips changes in different sucrose solution concentrations. We will use osmosis to do this. I will be measuring and controlling many different variables, including. The dependent Variable – Weight of potato chip.
We will do this about 4 times and see the difference and see if there is any change.
Accurately measure length and mass of the chips again after being in solution and record results. I will alter the molar of the sucrose solution for each potato to see how the concentration affects it. For my experiment I will test five potato chips and repeat my experiment 3 times to get the sufficient amount of results to be able
Size of potato-will be the same as it will be cut using a cork and borer which cuts them all to the same diameter.
Water Potential of Potato Cells Aim: To demonstrate the Water Potential of Potato Cells. Objectives: · To show the water potential of potato cells using various measured concentrations of a sucrose solution and pieces of potato. · To record and analyse data to verify observed results. · The method and procedure was carried out as per instruction sheet. Observations: The experiment shows that the lower the concentration of the sugar solution, in the Petri dish, the mass of the potato increased.
potato contains. From the graph I am able to see that from 0.0 to 0.3
Knife to cut the potato to the correct shape and size for reasons. stated in the method. Tile to not score any school surfaces. Test tubes to hold the potato and solution in. Beaker to alter solution concentration.
4. Put each group of potato discs in one of the 6 test tubes and watch
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water