Experiment : The Copper Cycle

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Experiment 8: The Copper Cycle
The main goal of this experiment was to observe series of reactions that convert a piece of copper metal, via several different copper-containing compounds, back into its original elemental form. The data collected was the striking color changes along with their relevant chemical equations. The data was collected while keeping a close eye on the experiment the whole time. The data recorded was used to see the different changes involved with a piece of copper metal. The copper was weighed and heated multiple times throughout the experiment
CHE 131 Experiment 8, General Chemistry 1 Lab, 1 Quarter 2015-2016, DePaul University. [Online] https://www.d2l.depaul.edu (November 09, 2015).
Data and Results
Table 1: Summary of Raw Data

Starting with the mass of the copper wire, this table recorded the weight (g) along with observations that occurred throughout the procedure. At the beginning of the procedure, 4.0 mL of concentrated nitric acid, HNO3 (16 M), was added to a 50 mL beaker containing a pre-cut, pre-cleaned piece of Copper (Cu) wire. A lively reaction occurred as the Cu was disolved, forming a brown, harmful gas inside the beaker. The gas was nitric oxide. To better describe the observation is the chemical equation,
Cu(s) + 4 HNO3(aq) —> Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l), where nitric acid dissolved copper and left the products, copper (II) nitrate, Cu(NO3)2, water, and nitrogen dioxide (NO2). After a while the gas
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