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Obtaining Zinc Oxide from Calamine

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Introduction

Obtaining Zinc Oxide from Calamine Introduction Calamine is a mineral containing zinc carbonate (ZnCO3) On heating it decomposes as: ZnCO3 ZnO + CO2 (C = 12, 0 = 16, Zn = 65) This equation allows you to calculate a theoretical conversion of calamine into zinc oxide. As when using the theoretical conversion; ZnCO3 ZnO + CO2 65+12+48 65+16 + 12+32 125 81 + 44 This means that one mole of calamine weighs 125g and when heated it produces 81g of zinc oxide and 44g of carbon dioxide. Therefore to work out how much zinc oxide is produced from 1g of calamine we divide 81 by 125. 81/125 = 0.648g To calculate how much zinc oxide is produced from 2g of calamine 0.648 is doubled: 0.648 x 2 = 1.296g To calculate how much zinc oxide is produced from 3g of calamine 0.648 is tripled and so on when increasing the mass of calamine. On the next page there is a table of the theoretical conversions for how much zinc oxide is produced from using certain amounts of calamine (1g-9g) ...read more.

Middle

4. The calamine is left to cool and then the tube is weighed. 5. The calamine is heated for a further 2 minutes, then cooled and re-weighed. If the mass of the boiling tube remained the same as the last time it was weighed then that mass is recorded. If the mass is different the calamine is heated for another 2 minutes and then cooled and re-weighed. The calamine continues to be reheated until the mass stays the same in two consecutive weightings. The above method is repeated with 2g, 3g, 4g and 5g of calamine. The whole experiment is then repeated. Safety Safety goggles are to be worn during the experiment, to protect eyes from dangerous fumes produced from using the Bunsen burner. Tongs should also be used to handle the mineral wool and to hold the boiling tube over the Bunsen burner flame to avoid injury. Results Mass of Calamine (g) Predicted amount of ZnO to be obtained (g) Mass of ZnO Obtained Exp. ...read more.

Conclusion

could have also stopped other matter in the calamine (which is not used for producing zinc oxide) from escaping. I think my results were also quite reliable as there wasn't very much scatter on my graph, all the points were close to my line of best fit. I also believe my results were reliable as the differences between the results in the first experiment and the results in the second were quite small. An exception to this was the experiment for 4g of calamine in experiment 1 the amount of zinc oxide obtained was 3.34 and in experiment 2 the amount obtained was only 2.64, a difference of 0.7g. If I could re-do this experiment I would like to repeat the whole experiment for a third time or at least do a third test using 4g of calamine, this would improve the accuracy of my results as it would help determine anomalous results, which would let me have the choice to not include it in my averages results. I am fairly proud of my experiment and believe if I had had more time and better quality resources my results would have been much more accurate and reliable. ...read more.

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