Question

I need help with finding the total added SCN concentration and Total added Fe3+. If I can see two examples of each, then I will be able to find the rest on my own.

Data Tab Molarity of stock KSCN solution Molarity of stock Fe(NOs)s solutiona Total added Total added Absorbance SCN cone Few cone at 447 nm Test mL Stock l Stoek Tube mL. H,o KSCN Fe(NO,)s M) 4.0 2 S dlo .2.S (o3 2. 1I. Data Collection- Quantitative: Fag+SCN (ag)FeSCN -ogy You will be using a spectrophotometer to measure the oolor intensity and thus the con FeSCN (aq) formed in several solutions. Since the experiments depend on concentrations, it for the precision of the results that the volume measurementa be made with care. Review Appendix D.1 on use of burets. Also, you should be careful not to unwittingly dilute or contaminate your solutions. the proper A. Label eight dry 150 mm test tubes as numbers 1 to 8. Obtain in separate, dry, labeled beakers 80 mL of KSCN solution and 80 mL. of FeiNOs)s solution. Record the exact molar concentration of each solution in the table on page 179. (Each solution contains HNO, at 0.3 M to prevent the formation of iron hydroxides) Clean two burets. Rinse one with two 5 mL. portions of the KSCN, and rinse the other with FeNO) solution. Fill each buret with the appropriate solution, making sure the tip is free of air gaps. Rinse and fill a third buret with distilled water Label each buret. You are to prepare eight solutions of the two reactants such that each contains the same amount of KSCN but differing amounts of Fe(NO,)s in 20,00 total mL. This will be done by carefully buretting B. mounts of the stock solutions into the test tubes. The amounts suggested are given in the following table mL H,0 Test Tube mL Stock KSCN mL Stock FeNOss 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 0.50 1,00 1.50 2.00 2.50 10.00 13.00 15.00 14.50 14.00 13.50 13.00 12.50 5.00 2.00 0.00 Make up your solutions recording the exact volumes used (to ± 0.01 mL) in the table on page 179. The order of addition of the reagents is not important. Mix each solution by stoppering with arubber stopper and inverting the tube several times. Shaking will not properly mix the reagents. Be sure to wipe the stopper dry between use with different test tubes. C Read the color intensity (absorbance) of the FeSCN+ in each solution and record it in the table. In using the spectrophotometer follow the directions provided by the instructor and/or those given in Appendix D.2. The light wavelength of 447 nm is suggested for the measurements Retain at least 5 mL of test solution #2 for use in part Ⅲ.C. If a spectrophotometer is not immediately available for your use, do parts IILA, B, and C while you are waiting.

Answer 1

3 kSen

2 1000ml一 060n