beer law - Name: ID Number: Section: Lab Partner: Note: All...

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Name: Section: ID Number: Lab Partner: Total Points = 60 pts (5 pts notebook, 55 pts template) DATA, GRAPHS AND CALCULATIONS 512.93 nm 1 pt Creating the calibration curve: Ferroin: Concentration (M) Absorbance 1.25E-05 0.170 2.50E-05 0.280 2 pts 3.75E-05 0.300 5.00E-05 0.500 6.25E-05 0.620 λ max: Purpose and Method Clearly state the purpose of this part of the lab. Explain how this is accomplished in this experiment. What calculations do you need to perform? What measurements will be made? [Do not provide experimental details here]. How do you go from calculated/measured values to accomplishing stated purpose? ( 10 pts: roughly divided 1 for the goal and 3 each for addressing each of the three parts of the experiment. ) Goal: to learn how to figure out the concentration of an unknown solution of iron using Beer's Law. Procedure 1: In the first procedure we had to prepare standard solutions from a stock solution. The equation that we had to use was M1V1=M2V2. Using this equation we were able to figure out the molarity of the ferroin after it was dilluted. Procedure 2: In the second procedure we obtained 20mg of iron tablet and added water, 2ml of 0.1 M HCL, 2ml of 0.23 M hydroxalmine hydrochloride, 1ml of 1.0M sodium acetate solution, and 3ml of 3.6X 10^-3M 1,10-phenanthroline. The equation that we had to use was M1V1=M2V2. Using this equation we were able to figure out the final volume of the mixture. Procedure 3: In the third procedure we had to use our stock solution and get the absorbance rate for each different solution. From the datas that we got, we then graph a absorbance vs. concentration of ferrion graph. The by finding the slope of the line, we are able to figure out the molarity of iron. Then with some stoichiometry we are then able to figure out the moles of iron and the mass of iron in each tablet. Experiment 2
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This note was uploaded on 02/11/2011 for the course CHEM 152 taught by Professor Chiu during the Winter '08 term at University of Washington.

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beer law - Name: ID Number: Section: Lab Partner: Note: All...

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