AP Chemistry Students Study Spectrophotometry
AP Chemistry students in Jennifer Torline’s class recently conducted an experiment to test spectrophotometry, a way of analyzing the transmittance of light through a solution, and calculate the percent mass of copper in brass. Students first made a copper nitrate solution via the reaction of brass with nitric acid. They analyzed the sample using a colorimeter, comparing their unknown to a standardized dilution curve. Students were able to calculate molarity, the number of moles of solute per liter of solution, and ultimately determine the amount of copper in the brass.