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Gravimetric Analysis for Phosphorus

Due Today: 1. Gravimetric Analysis of Phosphorus Pre-Lab 2. Redox Titration Short Report Homework: 1. Gravimetric Analysis of Phosphorus Formal Lab Report 2. Acid-Base Titration Pre-Lab. Gravimetric Analysis for Phosphorus. Objective.

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Gravimetric Analysis for Phosphorus

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  1. Due Today: 1. Gravimetric Analysis of Phosphorus Pre-Lab 2. Redox Titration Short Report Homework: 1. Gravimetric Analysis of Phosphorus Formal Lab Report 2. Acid-Base Titration Pre-Lab Gravimetric Analysis for Phosphorus

  2. Objective • Determine the phosphorus content of commercial fertilizer • Compare to reported value

  3. Key Terms • Quality Control Experiment – verify label • Phosphorus • Gravimetric Analysis – set of analytical methods to quantitatively determine an analyte based on the mass of a solid • Dissolve • Precipitate • Filter

  4. Procedure Notes • Skip Step 4 • Step 14&15 – masses should be within 0.010g • Collect Data from 2 additional groups

  5. Waste • Filtrate → sink • Filter Paper → trashcan • Acetone Filtrate → acetone waste container • Product → waste container in hood

  6. Risk assessment • Ammonium Hydroxide • Danger • Corrosive • Inhalation Hazard

  7. Risk assessment • Acetone • Danger • Flammable • Skin Irritant

  8. calculations • Mass % of P in MgNH4PO4: • Mass of P in Precipitate:

  9. Calculations • Use stoichiometry to convert from grams of P to grams of P2O5 • Mass % P2O5 :

  10. calculations • Percent Difference :

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