Chem 2 Lab 4 - z Chemical Equilibrium CHEM 113 PURPOSE The purpose of this experiment is to understand the reactions between an iron(III ion and

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z Chemical Equilibrium CHEM 113
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PURPOSE The purpose of this experiment is to understand the reactions between an iron (III) ion and thiocyanic acid (HSCN). This reaction will result in a soluble iron (III) thiocyanate complex ion that will give a distinctive red color. The red color will help us measure the concentration of four different species of thiocyanatoiron (III) in various solutions. Specifically, a spectrometer will be used to measure the amount of light absorbed at 447 nm wavelength. The solutions that will be used will vary in the amount of thiocyanic acid and hydrogen ions with the iron (III) ion being the same. After the experiment is finished a pattern should be observable. The solution with the highest concentration should result in a higher absorbent reading due to the fact that the absorbance of the complex is proportional to the molarity of Fe(SCN)2+ . PROCEDURES The first step is to obtain a 25.00mL volumetric flask and find the correct amount of needed to prepare 25.00 mL of 0.500 M nitric acid using the equation M1 x V1 = M2 X V2. Then fill the flask half full of water and dispense the correct amount of nitric acid. Then a
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This note was uploaded on 04/02/2008 for the course CHEM 113 taught by Professor Staff during the Spring '08 term at Western Michigan.

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Chem 2 Lab 4 - z Chemical Equilibrium CHEM 113 PURPOSE The purpose of this experiment is to understand the reactions between an iron(III ion and

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