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Science Investigation Into What Affects The Rate That An Aspirin Dissolves At In Water

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Science Investigation Into What Affects The Rate That An Aspirin Dissolves At In Water By Owain Bristow 10E3 I am investigating how two different factors will separately affect the rate at which a single aspirin dissolves in water, these are: * Temperature of water. * Surface area of aspirin. I could investigate the effects of stirring/agitating the solution and the use of a possible catalyst. However I feel it would be to hard to do the former accurately and fairly and regarding the latter there is no known catalyst that will speed up the dissolution of an aspirin in water, according to many science sites on the Internet. Concentration of water and aspirin would not affect the dissolution rate as at any time only the water touching the aspirin's outside can cause it to dissolve, this amount is always the same regardless of the amount of water, (providing the surface area remains constant). Temperature Method: 1) I will place 50ml of water in a beaker with a thermometer. 2) I will heat the water until it reaches the required temperature. 3) I will remove the beaker from the heat, take out the thermometer and put one aspirin into the water. 4) I will time how long it takes for the cross, drawn underneath the beaker, to disappear, and then record it on a table. I will move up in ten-degree steps between each successive experiment from a range of 30-90�C. ...read more.


The graph I expect to see of surface area against 1/time will look like this: Safety To be safe in both sets of experiments I will wear goggles, avoid burning or cutting myself, avoid spillage and not ingest any aspirins. Results Temperature Investigation Temperature of water. Time taken for cross to disappear-one (Seconds). Time two (Seconds) Time three (Seconds). Average time (Seconds). 1/average time. 30�C 25.56 25.93 25.61 25.70 0.04 40�C 16.32 15.49 15.27 15.69 0.06 50�C 15.45 13.27 14.95 14.55 0.07 60�C 7.25 7.12 7.64 7.35 0.14 70�C 4.65 4.72 4.66 4.68 0.21 80�C 2.74 2.96 1.99 2.56 0.39 90�C 2.67 1.51 2.50 2.25 0.44 Surface Area Investigation Relative fractions of aspirin used. Total surface area of aspirin (mm�) Time taken for cross to disappear- one (seconds). Time two (seconds). Time three (seconds). Average time (seconds). 1/average time. 1 339.3 50.17 53.35 51.62 51.71 0.02 1/2 411.3 31.52 30.64 32.47 31.54 0.03 1/3 447.3 27.34 26.82 25.40 26.52 0.04 1/4 483.3 21.84 22.59 23.40 22.61 0.04 1/8 627.3 12.84 15.54 12.66 13.68 0.07 Powder �? 8.96 6.80 9.67 8.48 0.12 Conclusions Temperature Investigation Looking at the second graph, showing rate (1/time) against temperature, as the temperature increases so does the rate of dissolution. . My prediction was that the relationship between temperature and rate of dissolution would be proportional however this is not the case, as the gradient of the curve gets increasingly steeper. ...read more.


Therefore I think I carried out the investigation quite accurately and carefully. The only result that does not fit the pattern quite as well is the measurement taken using quarters, this may have been because I did not cut the aspirin up accurately or cleanly and some of it was lost. Another area for error is, as mentioned in the temperature investigation the use of a cross as a method of measuring the dissolution rate. Unfortunately this was the only method available to me given the equipment I had. To improve my investigation I could find another, more accurate way of measuring the dissolution rate and also use a more cleaner and accurate instrument for cutting the aspirin with. I could also get a better stopwatch. To improve my results I could take more measurements at each stage for greater accuracy and also try and expand the range and number of results taken. I could do this by using more than one aspirin at a time and investigating the surface area of say, one and a half aspirins. I could also calculate the area of the little pieces more thoroughly and make cuts in different places to obtain results for a greater number of different surface areas. To extend my investigation I could use a different material, such as a sugar cube, and investigate the effects of changing its surface area. I could also see how using a different liquid changes the graph of surface area against one/time. ...read more.

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Here's what a teacher thought of this essay

3 star(s)

A very competent account of an investigation into factors affecting the solubility of aspirin in water. The writer carried out two separate experiments, changing first temperature and then surface area, and generated some useful data from both. A fair level of science was used to generate predictions and then analyse the data.

However, the essay would benefit considerably from the following improvements:

[1] A detailed introduction is needed which describes the physical principles involved in dissolving solutes into solvents, and in particular, dissolving solutes in water.

[2] Two clear hypotheses are needed which link the IVs with the DV. All investigations should begin with a testable hypothesis.

[3] Methods and controlled variables need to be dealt with separately.

[4] The analysis of results (which were good) needed to be more in-depth with reference to anomalies and the data's reliability (spread of results).

However, this was a good effort and with the improvements above would certainly gain the higher grades at GCSE.

3 stars

Marked by teacher Ross Robertson 24/06/2013

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