Analysis of Silver in an Alloy Essay

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Analysis of Silver in an Alloy Introduction In this experiment an alloy of silver will be analyzed to determine its silver content. The silver-copper alloy will be dissolved in nitric acid, the silver will be precipitated as silver chloride, and the silver chloride will be filtered, washed, dried and its mass determined. From the mass of the silver chloride formed and the mass of the original sample, you will be able to calculate the percent of silver in the alloy. Because the results are based on the mass of a product, this procedure is classified as a gravimetric analysis. Silver and copper are very nonreactive metals. Neither will dissolve in hydrochloric acid or sulfuric acid. The "oxidizing" acid nitric acid, HN03, is…show more content…
While in table 1 it is shown that we had to round to two decimal places lacing a small error. And not only that but also the fact that as table 2 shows that the final amount needed was .0131 g less to the actual mount that we added from table 1. During the procedure our percent error must of have come from loosing the silver ions. After heating we had to wash the moisture of the watch glass back into the beaker and there could have been a possibility that we didn’t wash of all of the silver back into the beaker. When it precipitated, some of the particles may have peptized causing us to filter out some of the silver chloride precipitate. Also when removing the filter paper from the buchner funnel some of the precipitate may have been lost, which is just due to human error. Which all experiments have. Discussion In the lab you must first dissolve the alloy in nitric acid; if the allot doesn't completely dissolve it may cause some error in your final result because not all of your silver ions were dissolved. You then must make a solution of distilled water added with sodium chloride. Once you calculate the amount of sodium chloride needed you must double the amount for the experiment to push the reaction to a full completion. This essentially should precipitate all of silver and none of the copper. No accurate balance is needed to measure out the sodium chloride because as long as you have an excess of
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