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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.

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Presentation on theme: "GRAVIMETRIC ANALYSIS FOR PHOSPHORUS Due Today: 1. Gravimetric Analysis of Phosphorus Pre- Lab 2. Redox Titration Short Report Homework: 1. Gravimetric."— Presentation transcript:

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

2  Determine the phosphorus content of commercial fertilizer  Compare to reported value OBJECTIVE

3  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 KEY TERMS

4  Skip Step 4  Step 14&15 – masses should be within 0.010g  Collect Data from 2 additional groups PROCEDURE NOTES

5  Filtrate → sink  Filter Paper → trashcan  Acetone Filtrate → acetone waste container  Product → waste container in hood WASTE

6  Ammonium Hydroxide  Danger  Corrosive  Inhalation Hazard RISK ASSESSMENT

7  Acetone  Danger  Flammable  Skin Irritant RISK ASSESSMENT

8 CALCULATIONS ■Mass % of P in MgNH 4 PO 4 : ■Mass of P in Precipitate:

9  Use stoichiometry to convert from grams of P to grams of P 2 O 5 CALCULATIONS ■Mass % P 2 O 5 :

10 CALCULATIONS ■Percent Difference :


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