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Permeability of a Membrane

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Introduction

Permeability of a Membrane Report Apparatus and Method Everything was one as set out in the plan. Table of Results Temperature �C Light Transmission % Average 30 95 92 91 93 40 88 83 81 84 50 75 73 78 75 60 66 88* 68 67 65 57 59 54 57 70 6 8 6 7 80 2 4 5 4 Average = 95+92+91 3 Comments The starred result has been classed as an anomaly due to its lack of concordance with the other two. ...read more.

Middle

Errors The random errors were: * Maintaining the temperature of the water bath +/- 10% (this was the most significant) * Human error in reading the thermometer +/- 2% * Human error in reading the colorimeter +/- 2% The systematic errors were: * Inaccuracies in the thermometer +/- 1% * Inaccuracies in the colorimeter +/- 5% Conclusions The graph shows clear negative correlation (i.e. As the temperature goes up the light transmission falls). This indicates that the membrane becomes more permeable at higher temperatures. ...read more.

Conclusion

This could have been overcome if an automated water bath could have been used; unfortunately this was not possible due to lack of apparatus. Another related problem was reading off the thermometer as one had to make sure it was not at an angle and that the line of sight was directly at the top of mercury to make sure that it was at the right temperature. The results are all stated to two significant figures, as it is reasonable to assume that the equitment was accurate to this degree of precision. It is therefore reasonable to assume that the conclusions drawn are both reliable and accurate. ?? ?? ?? ?? ...read more.

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