Experiment 25 - Experiment 25: The Fertilizer Project...

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Experiment 25: The Fertilizer Project – Analysis of Phosphorus in Fertilizer Jonathan Brate Group Members: Anna Cumtell, Carter Stitt, Ed Lynch Monday 2:00-5:00 Group 1 TA: Carolina Garcia Introduction: The overall objective of Experiment 25 is to apply a real world situation to the chemistry lab. The purpose is to determine the phosphorous content in a sample of fertilizer using two different standard procedures, and, based on those results, determine which procedure is the most efficient at determining the phosphorous content of a sample of fertilizer. This was done by taking the two provided standard procedures and designating two people to each. Each person then performed their procedure independently two times, creating four trials for each procedure. This was done to mimic the idea that, in industry, chemists work in teams in order to come up with results that are more reliable and quicker than what could be obtained individually. The two methods used were gravimetric analysis and spectrophotometric analysis. Each member of the group was also responsible for coming up with a protocol in order to further enhance the simulation of a real world experience. A lecture topic that was covered in Experiment 25 is the calculation and understanding of the concept of molarity. Molarity is the number of moles of the solute divided by the volume of
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the solution in liters. This was used extensively in the experiment in order to calculate the concentration of phosphorous in a number of different solutions. With the concentration known, the amount of phosphorous in a given solution could then be calculated. Another lecture topic covered in Experiment 25 is the use of calculations to determine the percent of P 2 O 5 in a given substance. Without the ability to do this we would not be able to determine the phosphorous in the fertilizer and the whole experimental procedure would be rendered useless. There were an array of lab techniques used in Experiment 25 but I will only focus on two. One technique that was intricate in the spectrophotometric analysis was the use of the spectrometer in coordination with the MeasureNet System. By measuring the absorbance of variously concentrated solutions we could determine their phosphorous concentration. Another technique, which was more intricate in the gravimetric analysis, was the use of the suction flask. By using the suction flask we were able to actually separate the phosphorous from the solution itself. This allowed us to weigh the amount of phosphorous in a given sample of fertilizer and conclude the phosphorous concentration. Experimental Procedure:
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This note was uploaded on 10/20/2011 for the course ENGIN 200 taught by Professor Miller during the Spring '11 term at University of Cincinnati.

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Experiment 25 - Experiment 25: The Fertilizer Project...

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