(Solved): Experiment 4: Equilibrium (Le Chtlier's Priniciple) Name: Lab Partner: Data: Fill in any blanks w ...

Experiment 4: Equilibrium (Le Châtlier's Priniciple) Name: Lab Partner: Data: Fill in any blanks with essential data collected from the experiment. Calculations: (Show all calculations below and on a separate sheet of paper if needed.) Procedure: Obtain \( 10 \times \) small or medium test tubes, \( 1 \times \) test tube rack, \( 2 \times 10 \mathrm{~mL} \) graduated cylinders, and \( 1 \times \) cuvet. You will first set up 5 test tubes that will house your reference solutions. The reference solutions will be used to construct a calibration curve. Use the table below with the correct concentrations to make up the reference solutions. Table 1: Reference Solutions "All volumes are measured in mL's. You will next construct a series of test solutions using the following table. Table 2: Test Solutions -All vorumes are measurea in mL s. After all solutions have been prepared you will need to measure their absorbances with the Spec 20. Take your test solutions and cuvet to either one of the Spec 20's that are open. First you will need to make sure the Spec 20 is set to \( 450 \mathrm{~nm} \). Second you will need to prepare a blank sample by rinsing out the cuvet with distilled water. Then fill it \( 3 / 4 \) ways up to the top. Set the cuvet into the Spec 20 as your instructor showed you and press \( 0 / 100 \% \mathrm{~T} \). Be sure that you mark which direction the cuvet is placed so that it is consistent with the rest of the measurements you take. This will zero the machine out and only measure what solutions that you use. Next you will measure the absorbances for all reference and test solutions. Between each solution be sure to clean the cuvet with distilled water and make sure that it is dry before placing the next solution into it. Also, be sure to wipe off any fingerprints from around the cuvet so that they do not get measured. Once the measurements are complete you then take what is left of your solutions back to your desk. Do not clean or throw anything away until your calculations are complete. * "Please refer to the Appendix for a refresher on spectroscopy.***