Namels) Class ID LAB 8: CU ISOLATION OBJECTIVES Students can use Kp to determine

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Namels) Class ID LAB 8: CU ISOLATION OBJECTIVES Students can use Kp to determine product losses in washing steps. " Students use percent yield to determine efficiency of lab procedure can add equations that describe multiple reactions to determine the thermodynamic parameters of the combined reactions (the final equation) * Students can use 4,n, as,in, T, and AG to determine temperature at reaction is spontaneous INTRODUCTION To the left is a picture of the Berkley Mine Pit near Butte, Montana. Formerly an open pit copper mine, the mine shut down operations in 1982 and since then ground water has filled the mine. Over time the dissolution of transition metal ions has led to the creation of an acidic pool of water that is laden with Cu, Cd, and Zn ions. As the metal ion content builds in the water, the pH of the water lowers which increases the capacity of the water to oxidize more metals making them water soluble and thus, the water continues to lower in pH. Pumps that removed water from the pit have been turned off so, it's also estimated that the water will rise until it reaches the natural start to drain back into the ground water contaminating the water around the city from the pit and sell it to help finance further clean-up efforts. Currently there are Photo of Berkley Mine Pit water table (estimated for 2020). When this occurs, the pit will reverse flow and of Butte. Thus, Berkeley has been designated an EPA Superfund site and plans have been formed to remediate the site. One strategy is to recover the copper approximately 1.7 x 10 liters of water in the pit with copper concentrations of 180 might not only finance the cleanup it might even turn a profit. In this lab, chemical ppm Cu2. With 2015 copper prices at $00.05/g, the recovery and sale of copper technicians will apply a methodology to selectively precipitate copper ions from water and convert them with thermal reduction to pure copper. During part 1 of the lab, technicians will precipitate basic copper carbonate, Cu2(OH)2co3(s) out of a 1.0M solution of copper II sulfate (Equation 1 and 2). This precipitate is also the predominate compound in the mineral malachite or mal- achite green. In the second part of the lab, technicians will he at the basic copper carbonate which will force a conversion to copper (II) oxide (Equation 3). Finally, a redox reaction will be performed in the presence of carbon powder such that the carbon will turn to carbon dioxide and the copper II will be converted to copper metal (Equation 6). Students will evaluate efficiency of each step and determine Lab 8: Cu Isolation 65

Explanation / Answer

9. in the equation 6, copper oxide undergoes reduction (beacause the oxidation state +2 is decreased to 0)

Copper oxide undergoes reduction and copper undergoes oxidation in that redox reaction

2 electrons were transfered.

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