Question

Can someone explain to me two possible objectives of this lab? Thank you

Part B: Determining the Concentration of a Solution: Beer's Law The objective of this experiment is to determine the concentration of an unknow sulfate (Ns04) known concentrations (standard solutions) An aliuot of each selution is tranaferred to a small rectangular cuvette that is placed into the solution and etry You are to prepare ive Ni504 solutions of ometer. The amount of Light that ) solution through use of strikes the photocell is used to determine the absorbance of s concentration is plotted for the standard solutions a direct relat each sol should result, as a solution is known as shown below. The Beer's law direct relationship between absorbance and concentration for Beer's La Figure 1: Beer's law plot concentration of an unknown NIS04 solution is then determined by measuring its abserbance r. By locating the absorbance of the unknown on the vertical axis of the graph concentration can be found on the horizontal axis (follow the arrows in Figure 1). The concentration of the unknown can also be found graphically Procedure 1 The Niso 4 solution and the water for the dilutions will be delivered from burettes, Rather than set up two burettes, one bench pair should set up the NiS04 burette, and the other pair of stadents the water burette. These burettes should be carefully prepared, all air bubbles out of the tips, etc. You will need about 70 ml of 040 M NiSO4 stock solution, this will be sufficient for both pairs. Obtain this solution in a 250 mL beaker UM four dean and dry test tubes #1-5 (the fifth solution is the standard 0.40 M Ni04). Add 2.00. 4.00, 6.00, and 8.00 mL of 0.40 M NISO4 solution into test tubes #1-4, respectively. Then deliver go. 6.00, 400, and 2.00 mL of deionized water into test tubes #1-4, respectively. The total volume in each case will be 10.00 ml. Thoroughly mix each solution, this is very important. Place approdmately S ml of the 0.40M NİSOg into test tube #5. Volumes for the trials are summarized below and you will have to calculate the concentrations 2 Trial 0.40 M NISO4 H20 Concentration Number(ml.) (mL) 2.00 4.00 6.00 8.00 0.40

Answer 1