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Vanadyl Sulfate Lab Report

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The experimental started out with the synthesis of VIVO(acac)2. The vanadyl sulfate was dissolve in distilled water and mixed with acetylacetone, which gave a dark blue solution. From the reaction, sulfate anion was present in the solution, which could react with water in the solution to make the acid, hydrogen sulfate. Therefore, the acid had to be neutralized with sodium bicarbonate. Upon adding sodium bicarbonate, the reaction bubbled releasing CO2 gas and the solution slightly increased to a lighter blue color. Upon completion of the reaction, the greenish-blue precipitate was vacuum filtered and weighed. A mass of 0.4194g of VIVO(acac)2 with a percent yield of 24.8%. The percent yield was low, but that was most likely due to not allowing …show more content…

FeCl3∙6H2O was dissolved in water to give an orange solution. Potassium hydroxide was added to the solution until pH of 8. The potassium hydroxide dissociated in solution and the hydroxide ions bonded with the iron precipitating out orange FeOH crystals. The precipitate was collected using vacuum filtration and then added to an acetylacetone solution. The solution was stirred until it became slushy and held at room temperature for 30 minutes with occasional stirring. The solution was then cooled to 0˚C and then collected using vacuum filtration, where 1.2725g of orange FeIII¬(acac)3 was obtained giving a percent yield of 97.0%. The percent yield was high, but that is mostly due to the precipitate being wet. A lot of the product stuck to the glassware and the Buchner funnel resulting in a loss of …show more content…

A third sample of zinc acetate dihydrate was used for benchtop magnetic susceptibility. By using the data from Table 1, the experimental magnet moment (µeff) was calculation using the equations in Appendix A. In the order of zinc acetate dihydrate, VIVO(acac)2 and FeIII(acac)3, the respective magnet moments were determined to be 2.96, 1.20 and 4.73. The data agrees with what would be expected looking at the electronic states of the metal atoms. Vanadium is in the D5 group of the period table so it is had five unpaired electrons in the D-orbital. Since experimentally V(IV) is produced, that means vanadium has a positive four oxidation state reducing its unpaired electrons in the D-orbital to one. For iron, it is in the D8 group and has a positive three oxidation state so it has a total of five unpaired electrons in its D-orbital. Zinc is in the D10 group and is in the ground state, where all its electrons are paired. Since the magnetic susceptibility is measuring the number of unpaired electrons reacting with a magnetic field, the results demonstrate that by an increase in magnetic moments with the increase in the number of unpaired electrons. The only discrepancy with the data is that the two water molecules in the zinc acetate dihydrate wasn’t accounted for in determining magnetic susceptibility. The magnetic moment of zinc acetate dihydrate was higher than

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