-same because the detector is just detecting what came through the sample. 4) Brass is a metal alloy composed of: copper, zinc, tin, and lead. This is due to copper being too soft in its pure state. Brass can be dissolved in concentrated nitric acid, which then gives off a bright blue color due to the copper (zinc, lead, and tin ions are colorless). If you were to do a spectrophotometric analysis of the amount of copper found in a brass sample, approximately which wavelength would you select to conduct your analysis and why? (5 points) -600nm because if it is blue it should absorb orange color which is opposite wavelength of blue. 5) Experimental Dilution a. Show the calculation you used to determine how to prepare the solution you were assigned in class. (2 points) V1=m2v2/m1 b. Write out a procedure describing how you will perform the dilution described in part a. Your procedure must include details about which type and size of glassware you will use. (2 points) 6) In order to prepare a phosphate solution of extremely low concentration, a serial dilution was conducted, as shown in the diagram below. If the phosphate concentration in the stock solution was 2.5 M, what is the resulting concentration in the last flask in the diagram? (5 points) 3.5*10^-9
Week 10: Pre-lab Worksheet (5 points) 1) Explain the purpose of a calibration curve in your own words.