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Copper Lab - darker blue The solution was settled over a...

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Dear Fredrick J. Smedley, It is the pleasure of GenChemCo Industries to write to your query into how much copper is in a US dime. The plan of attack: A 1967 US dime was dissolved in nitric acid. The dime began to fizz furiously a dark brown smoke was released; the smoke was kept in the beaker by the placement of a watch glass over its top. This containment kept the solution a brown color, once released however the liquid turned to a turquoise blue. Water then sodium hydroxide was added to the solution. Upon the sodium hydroxide hitting the water and nitric acid solution, a solid was formed and the solution turned greener, a gas was also emitted. Additional sodium hydroxide was added until the solid was unable to be dissolved and the glass had become warm to the touch. The blue solid settled on the bottom of the beaker with a green liquid above. When even m ore sodium hydroxide was added the liquid became a
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Unformatted text preview: darker blue. The solution was settled over a blue/purple flame and was consistently heated and stirred. The solution became very thick and turned a dark grey color before it was allowed to cool. On the bottom of the beaker the solid was allowed to settle and the liquid remained on top. Once this was settled the liquid was decanted of a light green/yellow liquid. Sulfuric acid was added to the brown/black solution until it turned a blue/green color. Zinc was then added to the solution, a yellow gas was emitted and the solution started to bubble. It then turned maroon and was warm to the touch, debris began to float. After the solution was decanted and filtered. The filter paper was dried and the weight of the copper in the dime was determined. The weight of the coin before it was destroyed was divided by the weight of the copper to find the percent by mass- 22.29%....
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