1. 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

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 :