Synthesizing Sodium Ferrate Lab Report Example | Topics and Well Written Essays - 1250 words

Synthesizing Sodium Ferrate - Lab Report Example NaClO is an active component of bleach. Very concentrated solutions of bleach are used as â€Å"liquid chlorine† for swimming pools. NOTE: This synthesis will be performed in the fume hood. The solution will be very basic, so goggles will always be worn while performing this synthesis. Any solution got on hands will be immediately washed with soap and water. 20 mL of commercial bleach is to be poured into a 50 mL beaker. A stirring bar will be added to the beaker and placed on a stir plate. 10 g of NaOH pellets will be added to the beaker of bleach and stirring will be begun. This is an exothermic reaction so the beaker will get warm. 0.50 mL of 0.30 M FeCl3 will be pipetted using the plastic pipette into the dissolved NaOH solution while it is still warm. The mixture will be allowed to stir for approximately 10 minutes. The solution will be allowed to cool for another 3-5 minutes. The formation of the Na2FeO4 will cause the solution to appear purple. Any foam that appears on the surface will have to be removed by blotting with a paper towel. A suction filtration apparatus will be assembled with due consultation of the GSA). A sintered glass filter will be used on top of the vacuum filtration flask, the vacuum will be turned on and the sodium ferrate solution will be added slowly. ... The volume of ferrate solution that was prepared using a graduated cylinder will be measured. The sodium ferrate solution will be stored in a plastic bottle. The bottle will be labeled with this information; Name of the Team Manager, â€Å"Sodium ferrate in water†, concentration of sodium ferrate (will be determined later), date, and the lab section number. Part 2. Calculation of the Percent Yield of Ferrate Produced In the reaction that was just performed, FeCl3 was the limiting reagent. After the theoretical yield (review is on pages133-139 in the textbook, Tro 2nd edition) of sodium ferrate has been calculated in moles, its theoretical concentration, in molarity (M) will be determined with the help of the total volume of solution that was measured in the Part 1. The actual concentration of sodium ferrate in the solution will be calculated with the help of the spectrophotometer and Beer’s Law. The SpectraVis spectrometer will be calibrated with the help of a cuvette o f DI water. The SpectraVis should be in full spectrum mode when calibrating. The DI water will be removed with a plastic pipette so that all the water droplets from the inside corners as well as from the sides of the cuvette can be removed. The sodium ferrate solution will be added to the cuvette (slightly more than half full). The absorbance of the sodium ferrate solution will be recorded at 510 nm. NOTE: If the absorbance at 510 nm gets above 1.5, the ferrate solution in the cuvette will be diluted (not the original solution) until the absorbance is between 1.0 and 1.5. The volume of ferrate solution that was diluted as well as the amount of water which was added to calculate the concentration of the original ferrate solution will be kept track of. The ferrate solution will be