Investigate what effect different levels of concentration of sucrose solution have on the movement of water via osmosis in potatoes. EQUIPMENT Sucrose solution (0.2M, 0.4M, 0.6M, 0.8M, 1.0M) Distilled water (0.0M) Potatoes Cork borer Boiling tubes Boiling tube rack Stop clock Balance (0.0 decimal places) Tweezers Measuring cylinder Ruler METHOD Cut 6 pieces of potato with a cork borer and cut them to the same length of approximately 5 cm (measure with a ruler) Measure out 25cm³ of water and each of the sucrose solutions, using the measuring cylinder. The measurements for the solutions have to be perfect as to not change the outcome of the experiment. Pour into boiling tubes, giving the various concentrations. Label boiling tubes with concentration of sucrose solution Take measurements of each potato tube (mass) on the balance and record in a suitable table.
This is because the concentration of sucrose solution is more than the concentration of the cytoplasm IV: The mass of the piece of the potato and solute concentration (sucrose) Levels of IV: For the mass, the mass will equal 1.4g and for the solute concentration we will use distilled water (0%), 2%, 4%, 8%, and 16%. DV: What affect does concentration of solution have on potato tissue? What exactly am I measuring: the mass of the potato piece after it has been in the solute concentration for 30 min. Controlled Variables: In my investigation, I will be controlling the following variables: * Length of potato cylinder; * Amount of solution / water; * Type of potato; * Size of
Potato Powered Clock Theory: Potato as a Battery Hypothesis: Potatoes have starch in them which is a natural sugar that can be broken down naturally for a release of energy and generate enough power to run a digital clock. Problem Statement: Can ordinary potatoes power a digital clock for more than 24 hours? Variables: * Independent Variable – Potato * Dependent Variables – Clock, connection wires, copper and zinc plates Materials Needed: * Digital Clock with 2 Wires * 6.25” Connecting Wire * Transparent Tape * 2 4” Copper Strips * 2 4” Zinc Strips * 2 Potatoes (Oranges worked too) Background: How it works * A potato can be used as a battery by using strips of zinc and copper in the acidic juice of the potato to provide power to a digital clock. * With the zinc strip, the natural acid in the potato dissolves the zinc freeing electrons. * The copper wire uses the electrons that the zinc wire frees.
This researcher called his experiment" Bound water" "The water of Potato Tissue Potential". (Clemson University by Robert J. Kosinski) Quote: He talked about how, when using organic materials and beakers, there can be predictions made of how sucrose or NaCl molecules will bind up any hydrophilic solute if it is diffusing within a membranous condition. Because the potato is semi permeable , the potato tissue will always take up the water because the water is hypertonic and because it just simply moves into a concentration gradient. (Baumgarten and Feher, 1998; Weiss, 1996, pp. 216-222).
Title: An investigation on the amount of diffusion by osmosis over 24 hours in differing sucrose concentrations upon potato cubes. Abstract: The experiment was conducted to examine the rate and effect of diffusion by osmosis on potato pieces with different glucose concentrations over a course of 24 hours. The initial and final weight of the potato was weighed in mg. Five groups containing three 2x1cm3 potato cores. The five groups of three potatoes were placed into separate beakers of distilled water that contained different sucrose concentration percentages (0%, 25%, 50%, 75%, 100%) and then left over 24 hours in order for osmosis to have time to pass through the potatoes thick membrane. The final weighing of the potato cores weighed less than initially since the water is leaving the potato in order to evenly distribute itself amongst the sucrose.
Prediction: The potato chips will decrease in mass. Reasoning: Since the potato chips have a lower concentration of sugar, the water molecules from the potato chips will diffuse into the solution until they are both at the same concentration. Summary of Hypothesis The potato chips will increase in mass in solutions of lower sugar concentrations but will decrease in mass in solutions of higher sugar concentration. The Experiment -------------- I am going to carry out an experiment to measure the change in mass of potato chips left in a sugar solution for a period of 1 hour. I will carry out this experiment several times to ensure accurate results.
Our class observed each potato for two days. We noticed that on the first day the potato in the dark had three eyes and the potato in the light had six eyes. On the second day we noticed that the potato in the dark had four sprouts and the potato in the light had two sprouts. Data suggests that the potato grew better in the dark. It was a different outcome than what I thought.
Materials: 1 rectangular container 1 grease pencil 4 petri dishes 4 pieces of filter paper or paper towel 40 radish seeds (10 per petri dish) 1 paper plate Tweezers 100 mL beaker Stirring Stick Salt (1g, 2g and 3g)-measured out for you Dropper Procedure: (Don’t forget to take notes in your lab notebook. Keep a detailed description of every step you take so that someone else could accurately and precisely reproduce your results). See Lab Report Format for how your final Lab Report should look. 1. Determine what your group’s hypothesis will be and write it as an “if, then” statement on your lab report.
Introduction PURPOSE: The purpose of this experiment is to determine the effects of different salt concentrations on osmosis in potatoes. HYPOTHESIS: If the salt concentration increases then the osmosis in potatoes will change the color and texture of the potato because when the salt enters into the potato, osmosis will cause the potato to change. INDEPENDENT VARIABLE: The independent variable of this experiment is the different concentration of salt. DEPENDENT VARIABLE: The dependent variable of this experiment is the mass change (g) and the percentage change. CONTROLLED VARIABLE: The type of salt, type of distilled water, potato size, beakers/test tubes size, type of potato, location/storage, time, and amount of solution.
Record the results. 4) Potato and Peroxide- a small piece of potato and 2 ml of hydrogen peroxide. Record the rate of reaction. 5) Manganese dioxide and Peroxide- a pinch (tip of wood splint) of manganese dioxide to hydrogen peroxide. Record rate of reaction.