Conservation of Mass

Conservation of Mass - sulfate is toxic and an irritant....

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Conservation of Mass In this lab, we carried out a series of reactions involving the element copper. No copper is added or removed between the initial and final steps. Each reaction goes until completion, so theoretically the amount of copper recovered at the end of the experiment should be the same amount as what was added in the beginning. First we took a sample of copper and added nitric acid to produce copper nitrate and water. Then we added sodium hydroxide to the copper nitrate to produce copper (II) hydroxide and sodium nitrate. We then heated the copper (II) hydroxide to produce copper (II) oxide and water. Adding sulfuric acid produced copper (II) sulfate and water. Finally, we added zinc to create zinc sulfate and copper metal. We dealt with many hazardous chemicals in this lab. Nitric acid is toxic, corrosive and an oxidant. Sodium hydroxide and sulfuric acid are toxic and corrosive. Copper (II)
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Unformatted text preview: sulfate is toxic and an irritant. Zinc sulfate is an irritant and could be toxic. Copper (II) nitrate is toxic, corrosive and an oxidant. Hydrogen gas is produced as part of a reaction, and is highly flammable. This reaction should be performed under the hood. If any of the chemicals come into contact with skin, you should immediately flush with water. We disposed of all the chemicals into the ‘Conservation of Mass’ waste bottle. Initially, I used 0.357 g of copper metal. At the end of the experiment, I recovered .309 g of copper metal. The percent recovery was 86.6%. Theoretically, the mass of the end result should have been the same as the original amount. Errors made have been made during some of the reactions, such as not allowing enough time for it to react completely or perhaps not using enough of a chemical to completely react with the other....
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This note was uploaded on 08/15/2008 for the course CHM U212 taught by Professor Witten during the Fall '08 term at Northeastern.

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