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Loss Of Copper In A Penny Essay

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During this experiment one of the first steps could be the root for error. In order to allow the Hydrochloric Acid to reach the zinc interior of the penny, three indentions had to be filed into the penny, through the copper shell.This action allows for the significant loss of copper. Because when the penny is filed, it is only filed until the zinc interior could be seen which leaves a slight impact on weight, but a stronger impact on the amount of copper. For such a specific experiment that is followed by exact calculations, losing a single flaked of copper can have detrimental impacts on the outcome. In this particle experiment, the percent of copper in a post 1983 penny was found to be 2.37%. However the known amount of copper in a penny is 2.5%, which resulted in .13% difference. This slight difference can be used to calculate the percent error, which was discovered to be 5.2%. The percent error must be due to the filing of the copper. The filing of the copper was already known to be an impact to the experiment but it was tried to counteract the effects of it by weighing the penny after the indentations. Nonetheless, that solution only solves for the altered weight, not the loss of copper. …show more content…
There is the factor of zinc still left in the penny, but this can be obvious if the penny still produces a black powder when touched with a stirring rod. It is easy to avoid, while the filing has to occur for the experiment to work. Using Hydrochloric Acid also would have no impact on the copper nor the experiment. It is known that Hydrochloric acid does not react with copper, because copper is not reactive with that strength of acid, however zinc

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