Expt 2 Part B - Analysis

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Chemistry

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Feb 20, 2024

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Gravimetric Analysis of Phosphorus is in Plant Food? Analysis The precipitate formed in the procedure is MgNH 4 PO 4 . 6H 2 O and Miracle Gro reports the phosphorus content in the form of P 2 O 5 . • For both of the compounds above, name the compound and calculate the mass % of P in the compound: Molar Masses (g/mol) H N O Mg P 1.01 14.01 16.00 24.31 30.97 Your data includes the mass of the precipitate and the mass of the plant food sample. Your goals are to use this data to calculate the mass of P in plant food and the mass of P 2 O 5 in plant food using the mass % of P in P 2 O 5 and the mass % of P in MgNH 4 PO 4 . 6H 2 O. You can use these two values as “conversion factors” like the conversion factor for inches to centimeter is equal to 2.54cm/1in or the conversion factor from milliliters to liters is 1L/1000mL. Goals: ?𝑎?? % ?𝑓 ? 𝑖? ??𝑎?? 𝑓??𝑑 = ?𝑎?? ?𝑓 ? ?𝑎?? ?𝑓 ??𝑎?? 𝑓??𝑑 × 100% ?𝑎?? % ?𝑓 ? 2 ? 5 𝑖? ??𝑎?? 𝑓??𝑑 = ?𝑎?? ?𝑓 ? 2 ? 5 ?𝑎?? ?𝑓 ??𝑎?? 𝑓??𝑑 × 100% • Discuss with your group how to use the mass % values in your calculations. You should not need a periodic table from this point on. • For sample 1: what mass of phosphorus is in the precipitate? Use the mass % you calculated above as a conversion factor: • Calculate the mass % of phosphorus in the sample of plant food: • Use the mass % of phosphorus in P 2 O 5 as a conversion factor to convert the previous answer to into mass % of P 2 O 5 in the sample of plant food. Critical Thinking Questions: Discuss the following questions with your lab partner and lab mates. Remember to make any notes in your own words! 1) You are collecting all the initial sample masses and final precipitate masses from multiple trials. How will you estimate your error and report your results? 2) Why is it important to use certain chemicals, such as ammonia, in the fume hood rather than at the lab bench? What does the fume hood do? 2

3) Why is it important to allow the reaction mixture to stand in the fume hood for at least 15 minutes? 4) Would it be a good idea to heat up your suspended solid sample before vacuum filtering it? What would be a good temperature range to assure that the maximum amount of solid can be obtained? 5) What would be the effect on your analysis if you were not able to remove all copper cations or other insoluble solids from the solution?

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