However, in the larger chips, there was more clustering in the boiling tubes and some surface area was covered which hindered osmosis as it cannot take place in covered areas. I swiftly put 3 potato chips into each test tube and then started my stopwatch. I kept in mind that a scalpel is extremely sharp and dangerous if misused. My dependant variable is the percentage change in mass from the potato chip before it was placed in any solution, to the mass after it has been placed in the solution for a certain amount of time. I then worked out the average % change in mass. After a period of time the cells will become turgid. The experiment will be a fair test as I will keep the weight of the cut potato the same throughout the water and sugar solutions.
The potato chip will be measured before it is put in the solution, and after. Plant cells become turgid when they are put in dilute solutions. Diffusion is the movement of a substance along a concentration gradient from high to low. I will repeat this experiment 3 times. Contents in Bag Initial Mass Final Mass Mass Difference %Change in Mass Distilled Water 0.
This raisin has lost water by osmosis. Our hypothesis aims to prove that a larger pyramid will have a faster rate of diffusion and further extent, and for smaller, vice-versa. Here we present two methods of determining osmotic potential of plant tissues using potatoes. Molecules such as gases e. Aim How do different concentrations of sucrose solution effect potato tissue. Under ideal conditions, the water concentration outside is nearly identical to that inside.
Preliminary test: List of apparatus: List of Apparatus Why chosen and how used Beaker Holds the sucrose solution in. I wrote on these towels which molar they came from and the test number. Complete part 1A- structured inquiry to investigate celery sticks in water and salt water solutions. This happens because the sugar solution has a lower water concentration than the potato chips therefore the chips will lose water to make the water concentration even either side of the membrane. For the more able, slide 2 can be shown instead. An example of a partially permeable membrane is visking tubing.
Blot the bags to remove any sugar that may have spilled, check the bags for leaks. When plant cells are placed in a solution which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. We are basing our investigation on the process of osmosis. Background Scientific Information: In Osmosis is the movement of water from a place of high water concentration to a place of low water concentration through a partially permeable membrane. Some possible mistakes may have included inaccuracy cutting the triangles and timing being off.
Osmosis, the movement of water across a membrane, is a special case of diffusion. This is because the concentration gradient is greater meaning more water will have to pass out of the potatoes for equalization compared to weaker sugar solutions. I also said that if the concentration of sugar in the water is high, the potato will then have a higher water potential than the solution, which will result in water dispersing away from the potato and into the solution, causing the potato to lose mass. Â· A hypertonic solution has lower water potential. Hypothesis: Osmosis is defined as the net movement of water or any other solutionЎ s molecules from a region in which they are highly concentrated to a region in which they are less concentrated.
Background: Diffusion and osmosis are necessary for the efficient transport of substances in and out of, as well as throughout living cells. For instance if one of the potato chips was 1cm longer the surface area of the chip would be larger and there would therefore be more space for osmosis to occur. Water moved out of the cells. Then the potato pieces will be removed and dried using paper towels and then re-weighed. Then, calculate the volume of the portion of each cube that is still pink. The diffusion of water into and out of a selectively permeable membrane is called osmosis.
Osmosis happens so that the concentration outside the membrane is equal to the concentration inside the membrane. Cut off any potato skin. Variables To perform a fair experiment we have to change a variable while we keep the other the same. Sucrose solution This makes osmosis occur and see that difference it has made. This means that I will cut my potatoes equally, dry them off before weighing them the same way and also weigh them the same way, recording the results to a same amount of decimal places. Equipment 2 beakers — to contain the raisins and the solutions.
Osmosis Osmosis is the movement of water from a less concentrated solution to a more concentrated solution through a partially permeable membrane. A sugar solution is made from glucose and water. I will use these values to find the solute potential by using the calibration graph. Determine the mass of all 4 potato cylinders together and record. Or, working groups could be allocated tasks for the whole class, for example, setting up the range of dilutions, cutting the potato chips, recording data.