Stoichiometry lab report

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Marquette University *

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1001

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Chemistry

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Feb 20, 2024

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CHEM 1001 STOICHIOMETRY Laboratory Report NAME : Liam Cedeno Agosto DATE : 3/28/23 SECTION : 403 TA : Audrey Vice A. Goals/Purpose of Experiment ( 2 Points, ~50 words ) : The purpose of this experiment was to take the stoichiometry of a reaction and from that understand limiting reactants. To do this, we must also learn to use graphical analysis to figure out the ratio of the metal and ligand ion in this experiment. B. Theory/Introduction ( 6 Points, ~100 words ) : Balancing equations is an important part of chemical reactions, from that we can determine the mole ratio of a reactant and a product. This is called stoichiometry. More specifically, stoichiometry has to do with the calculations of the masses or volumes of the reactants of a chemical reaction. For this lab, we used two methods to determine the absorbance of a metal and ligand ion solution to ultimately find the mole ratio. These methods are Job ’ s method and mole ratio method. C. Procedure summary ( 5 Points, ~100 words ) : This experiment consisted of two parts. Part one consisted of Job ’ s method, where the total volume of the reactants is kept constant. In two burets, one with the metal solution and one with the ligand, we were to take increasing amounts of each solution into a 10 mL volumetric flask, starting from 0.50 of the metal and 4.50 of the ligand. The final volume was set to 10 mL using deionized water. From there, each solution was transferred onto a test tube, and from there we were to find the absorbance using a measure net station. The second part consisted of mole ratio method where the volume of ligand is kept constant at 5.00 mL for each test tube. And the volume of metal was increased by 0.50 increments for nine test tubes starting at 0.50. The same procedure as part one is followed. D. Results and Calculations: ( 12 Points ) :

Part 1: Job’s Method You can use this tutorial if you need help with the calculations. Copy and paste the link in your browser if clicking doesn’t work https://youtu.be/aket03N6jJA . Initial metal ion solution buret reading (mL) = 5.68 mL Initial ligand solution buret reading (mL) = 12.28 mL Table 1: Job ’ s method Test tube # Metal ion solution buret reading (mL) Volume of metal ion solution (mL) Ligand solution buret reading (mL) Volume of ligand solution (mL) Absorbance 1 5.68 0.50 12.28 4.5 0.373 2 6.78 1.00 16.39 4 0.619 3 8.28 1.50 19.86 3.50 0.617 4 10.29 2.00 22.89 3.00 0.490 5 12.91 2.50 25.7 2.50 0.607 6 15.91 3.00 27.72 2.00 0.377 7 19.42 3.50 29.25 1.50 0.277 8 23.39 4.00 30.25 1.00 0.213 9 27.85 4.50 30.77 0.50 0.096

Volume of metal ion at the intersection point = 1.52 mL Volume of ligand at the intersection point = 3.48 mL Moles of metal ion = 1.52 x 10^-6 Moles of ligand = 4.872 x 10^-6 Mole ratio (n) = 3.2=~ 3 Part 2: Mole Ratio Method Initial metal ion solution buret reading (mL) = 13. 54 mL Initial ligand solution buret reading (mL) = 20.91 Table 2: Mole ratio Test tube # Metal ion solution buret reading (mL) Volume of metal ion solution (mL) Ligand solution buret reading (mL) Volume of ligand solution (mL) Absorbance 1 13.54 0.50 20.91 5.00 0.370 2 14.59 1.00 25.94 5.00 0.629 3 16.08 1.50 30.95 5.00 0.784 4 18.08 2.00 35.97 5.00 0.899 5 20.59 2.50 40.99 5.00 0.835 6 23.59 3.00 19.88 5.00 0.843 7 26.55 3.50 24.82 5.00 0.797 8 30.61 4.00 29.81 5.00 0.880 9 32.15 4.50 32.84 5.00 0.832

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