Gravimetric Analysis for Phosphorus

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Presentation transcript:

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 Determine the phosphorus content of commercial fertilizer Compare to reported value

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

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

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

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

calculations Percent Difference :