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Experiment to investigate how equal masses of potato are effected in different concentrations of 1 molar sucrose soloution.

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Introduction

Tyler Watts. Experiment to investigate how equal masses of potato are effected in different concentrations of 1molar sucrose soloution. Aim: To investigate if osmosis occurs in potatoes, and if so, how it affects potatos of equal mass (2.5g) in different molar solutions of sucrose and water. Apparatus: -Cutting tile which will be used to cut the potato on. -Knife which will be used to peel the potato with and to cut to correct mass. -Burette which will be used to measure the solutions acurately. -Distilled water to make up solutions as part of the experiment sucrose to make up part of the experiment -Potatoes to cut into equal mass and observe what happens to them when left in differing concentrations of sucrose solution. -Tissue paper which will be used to dry the potatoes after the -Electronic Balance to weigh the potatoes acuratley. -Cork borer which will be used to cut out potato cylinders. -Boiling tubes to put 20ml of differing solutions into. Variables: -Concentration of solute. -Size or surface area of vegatable. -Type of vegatable. -Age of vegatable. -Length of time vegatable is left in solution for. *The variable used in this experiment has been highlighted in red. Planning: Before the planning the experiment, some will Background Information will be needed to find out about osmosis, and other matters related to osmosis, so that a prediction can be made. And to construct a way to make this a fair investigation. Having already done preliminary work on the rate of osmosis on potatoes of the same length when left for differing periods of time this investigation can be seen as a follow up to the previous one. Whereas in the previous experiment the variable was time, this experiment will be kept similar however the potatoes will be kept for the same amount of time but in differing concentrations of sucrose solution. Also, the potatoes have been changed from length to mass as mass will provide a more reliable set of results to analyse. ...read more.

Middle

*This prediction has been made regarding the fact that the potato pieces have all been taken from the same potato so as to keep the test a fair one. Fair Test: Fair testing is vital if the experiment is to work properly and produce accurate results. If this experiment isn't conducted fairly, the wrong results may be obtained, which could give the wrong conclusions. All measurements and the weights of the solutions and the potatoes must be as exact, and as accurate as possible. The measurements of the potatoes will be as accurate as possible for every single potato, this will be done by evenly cutting the potato pieces, and making them all exactly 2.5g by wieghing them on electronic scales. This will enable us to make the wieghts more accurate than if using a manual balance. (Or than using length which is what we used in our preliminary experiment) It will be nessecary to make sure that all the potato pieces are fully covered by the solution. This is because the potato should be fully submerged, therfore having total contact with the solution. When using the balance, the balance must be reading zero before we put the potato chips on it. This is so that a false reading is not obtained. And we will also be reading the measurements of the measuring cylinder by reading the bottom of the meniscus. We will use a burette to make our measuring for the solutions even more accurate than by eye (which is what we used in our preliminary experiment) All the potato pieces in the different solutions will be left at room temperature for the same amount of time as each other to keep it fair. Getting and experimenting with the exact measurements of molars and water is vital to this task. If the volume of one solution in a test tube is wrong then it will affect the pattern of results later on. ...read more.

Conclusion

If I were to do the experiment again but wanted to try and improve the outcome of the results then I would experiment with a wider range of sucrose solution (say ranging up to 2molar) and I would use smaller intervals ( say 0, 0.1, 0.2, 0.3, ... 1.8, 1.9, 2m) not only wolud this give me a more reliable and accurate set of results, it would also mean that when plotting a graph it would too be more accurate, and a lot easier to plot points creating a better graph. In my experiment repeating the same tasks many other times would have been useful, since we had only done the results (set of 3) once, and NOT ALL the results were reliable, (there was the previously mentioned anomolie). From this experiment there is large scope for future experiments that could use this investigation as preliminary work. For example simply changing a different variable, would lead on to a whole new experiment. This change could be either type of vegatable used (instead of potato a carrot may be used to see how the rate of osmosis differenciates between the two), age of vegatable (potatoes could be used that are different ages, such as 2months old, 4months, 6months, 8months, 10months and a year old to see how the rate of osmosis changes as the age of the potato increases) or the length of time that the potato is left in the same concentration of solution ( example: 10mins, 20mins, 30mins, 40mins, 50mins and an hour) *this was what we used for our preliminary work which we discovered the rate of osmosis becomes greater but directly proportionally until eventually an equilibriam is reached. Or the size/ surface area of the potato could be altered in the same concentration of sucrose solution. ( ie, lengths of 1cm, 1.5cm, 2cm, 2.5cm and 3cm, or wieghts of 1g, 1.5g, 2g, 2.5g and 3g to see how osmosis differs as the length/mass of potato increases. ...read more.

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