100%(8)8 out of 8 people found this document helpful
This preview shows page 1 - 2 out of 3 pages.
Determination of Copper in a PennyChemistry 112L Section 001September 10, 2014Analysis Questions1.Calibration curve is under Observations & Results2.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, 0.101521153 = 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 0.101521153/2.532 = 0.0400952421. That means that our penny is 4.01% copper.A.Research QuestionWhat use does the molar absorptivity calibration curve have?B.Observations & ResultsFeatures of your unknownOur 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.