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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

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**Objective Determine the phosphorus content of commercial fertilizer**

Compare to reported value

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**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

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**Procedure Notes Skip Step 4**

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

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**Waste Filtrate → sink Filter Paper → trashcan**

Acetone Filtrate → acetone waste container Product → waste container in hood

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Risk assessment Ammonium Hydroxide Danger Corrosive Inhalation Hazard

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Risk assessment Acetone Danger Flammable Skin Irritant

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calculations Mass % of P in MgNH4PO4: Mass of P in Precipitate:

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

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calculations Percent Difference :

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