Chem Lab #4

Chem Lab #4 - Can We Mine This Ore? Lab Partners: Alexandra...

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Can We Mine This Ore? Lab Partners: Alexandra Cross Jarrod Harbour Angel Vilario TA: Josie Castillo October 9, 2008
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Introduction : Mining can be both an expensive and difficult task. In order to make the expenses and labor worthwhile, it is important to determine which sites are best to drill. To do this, geologists must gather rock samples from a specific location and analyze the underground deposits to make sure the site is an acceptable source of the desired metal; in this case, copper. Once the copper ore sample is collected, geologists crush the ore and mix it with an acid to dissolve the copper. By doing several tests involving absorbance, concentration, and dilutions, which will be explained in detail in the procedure, the percent of copper from the ore can be determined. Based on the guidelines of copper mining, the percent will determine whether the site is worth drilling. Experimental : Materials: Processed copper ore Cu(NO 3 ) 2 3H 2 O (s) 6 M HNO 3(aq) 6 M HCl (aq) 6 M CH 3 CO 2 H (aq) 6 M NH 3(aq) Filter paper Device for measuring light absorbance- colorimeter Cuvettes
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Tissues Balances Volume measuring equipment Beakers Procedure: The first step is the extraction of the copper ore. Three different beakers were set up and about one gram of copper ore was put into each. Then, about 10-20 mL of each acid (nitric, hydrochloric, and acetic) were added to each designated beaker to see which would dissolve the ore most quickly and most thoroughly. After about 15 minutes, the beakers were observed to see which acid was the one was most efficient in dissolving most of the copper. The next step is to determine which wavelength is best to measure the absorbance of the copper solution using a colorimeter. When the copper ore is dissolved in the nitric acid, it produces a light blue color. About 10 mL of ammonia was added to the solution to produce a dark blue color for a more definite reading, and water was added to fill the rest of the volumetric flask containing the ore sample with a final volume of 100 ml. Just based on the color wheel, the wavelength can be predicted to understand which wavelength would be best to use. In order to check
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Chem Lab #4 - Can We Mine This Ore? Lab Partners: Alexandra...

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