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Published byLauren Weyman Modified about 1 year ago

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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

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

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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

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

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

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Ammonium Hydroxide Danger Corrosive Inhalation Hazard RISK ASSESSMENT

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Acetone Danger Flammable Skin Irritant RISK ASSESSMENT

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

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

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CALCULATIONS ■Percent Difference :

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