Question

Name T, day's Date Partner Instructor Section Pre-Laboratory Assignment Complete prclab questions prior to lalbs. Prelab questions will be collected before the prelab ecrure. All answers must be handw ritton neatly. Show all cakculations. A student measured the absorbance, A, of a solution of FeSCN and obtained the following vahcs: 1. Sample ti A 0.356 Is onc.) What is the ratio of concentrations of these two samples? Sampke 2 A 0.0545 directly proportional o, inversely proportional to cecentrabon? (Grck FeSCN 1 FeSCN, 2. A student mised 5.00 ml. of 0.100 M Fe(NOh with 50.00 ml. of 2.00 x 10 M KSCN. The with a pathlength of 1.00 cm. The absorbance reading was 0.615. Compute the following student measured the absorbance of onc aliquor of the solution at a wavelength of 447 nm, quantities (use the back of this shect or another sheet of paper for additional space): b. (mols FeSCN) (mols Fe"-- c. d. (mols SCN) 'An aliquot в simply aportion taken fren the whole minure after it has come to equilibrium. It in sample of the mixtuee. Spectrophotometric Determination of an Equilibrium Constant 147

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