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Extracting Copper from Malachite

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Introduction

Chemistry Extracting Copper from Malachite We extracted Copper from Malachite using a displacement reaction. Although electrolysis can also be used. We used 5g of malachite and dissolved it in sulphuric acid; this was to separate the sand and the copper, because the copper dissolves into the solution but the sand remains separate. This was an exothermic reaction. We then filtered the solution to separate the sand from the Copper Sulphate solution. We then dried the sand in order to remove any excess water and weighed it. Then using a displacement reaction we added zinc to the solution (because it is higher in the reactivity series than copper) ...read more.

Middle

12 Total= 239 Cu = 127 = 127 239 100 = 53% Evaluation Our plan worked considerably well as we succeeded in extracting copper from its ore. The theoretical percentage is the approximate percentage of Cu that should've been extracted throughout the experiment. So there should have been 53% of Cu extracted. In our experiment 51.4% of Cu was extracted. In comparison with the theory this is a similar percentage, so our experiment must have been quite accurate. The extra 1.6% of Cu could've been lost throughout the experiment, this could occur during the filtering process or the dissolving process as the Cu may not have dissolved fully or been filtered as accurately as possible, this is due to human error and so can not be altered. ...read more.

Conclusion

The class results were mainly similar and some of the experiments were carried out extremely accurately. However some of the result seem out of place, such as 66% and the lower percentages such as 43%, these highlight experiments that were perhaps carried out inaccurately as these numbers are not possible to obtain in this experiment. This is due to the theoretical percentage, as the percentages should be similar. Overall the percentages obtained were similar to the theoretical result. Therefore the experiments must have been carried out successfully. As the lost Cu can be explained the experiments were a success, showing that a percentage of Cu similar to that of the theoretical explanation, can be extracted from Malachite by using a displacement reaction. ...read more.

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Here's what a star student thought of this essay

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Response to the question

The response to the investigation is done well. The candidate successfully explains the experiment and the experiment seems accurate and done correctly. The only improvement would be the layout of the working out which is hard to interpret. The evaluation ...

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Response to the question

The response to the investigation is done well. The candidate successfully explains the experiment and the experiment seems accurate and done correctly. The only improvement would be the layout of the working out which is hard to interpret. The evaluation could be improved by pointing out things that may have confounded the experiment results and other possible improvements

Level of analysis

The method is not very clear as it is not presented in consecutive stages or steps that are clearly defined. The candidate should have used bullet points. Apart from this the experiment can be followed and the candidate mainly communicates clearly. The % copper calculations used are not clear in how they are worked out. The theoretical % is also not presented clearly in the working out. The candidate points out improvements to the things that may have gone wrong in the experiment which is good, and the candidate correctly compares actual figures to theoretical figures.

Quality of writing

The punctuation, grammar and spelling are all to a good standard. The layout is done okay being split into clear subheadings and paragraphs, but sometimes the text is waffly and hard to follow.


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Reviewed by skatealexia 24/07/2012

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