Determination of Copper in a Penny Post Lab

Determination of Copper in a Penny Post Lab - Determination...

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Determination of Copper in a Penny Chemistry 112L Section 001 September 10, 2014 Analysis Questions 1. Calibration curve is under Observations & Results 2. Absorbance line equation is y = 3.0043x, where y is the absorbance and x is the concentration. Our penny solution’s absorbance is 0.102. When we plug 0.305 in for y(absorbance) in the equation x(concentration) will equal 0.102. 0.305 = 3.0043x, 0.305/3.0043 = x, 0.101 521153 = x, 0.102 = x. That means that the mass of copper in our penny solution is 0.102 g. 3. To calculate the percent of copper in our penny we divided the mass of copper in our penny solution by the total mass of our penny. The mass of copper in our penny solution is still 0.102 g and the total mass of our penny is 2.532 g. This looks like 0.101 521153/2.532 = 0.0400 952421. That means that our penny is 4.01% copper. A. Research Question What use does the molar absorptivity calibration curve have? B. Observations & Results Features of your unknown Our penny was made in the year of 1986. When we weighed our penny it was 2.532 g. It was a fairly clean penny; it wasn’t black, gunky, and gross looking like some pennies.
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