lab9report - Carla Paulo Exercise 9 Spectrophometric...

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Carla Paulo Exercise 9 Spectrophometric Studies of the Iron(III)-Salicylic Acid Complex Ion Purpose: To determine the number of SAL ligands which combine with iron (III) to form iron(III)-SAL complex ion, as well as the salycilic acid content of an unknown solution and a commercial product. Unknown #: SAL unknown: 9C Face wash B: 2.0% Salicylic acid Important Equations: Fe 3+ + 6CN - Fe(CN) 3- 6 Beer’s Law: ε bc Safety Factors: Use gloves to avoid skin contact. Deionized water must be used. Raw Data: Solution NaSAL Concentration 1 8x10 -5 2 1.6x10 -4 3 2.4x10 -4 4 3.2x10 -4 Calculation of concentrations was found using formula M 1 V 1 =M 2 V 2 See additional pages for data obtained in the experiment. Treatment of Results:
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1. Looking at the graph, M appears to be at absorbance 1.2 and L appears to be at a mole fraction 0.11, giving a ratio of M 10 L which shows that the formula would be 10Fe/SAL. 2. The calibration curve given by the program is y=1049.042x, where y is the absorbance
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lab9report - Carla Paulo Exercise 9 Spectrophometric...

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