gravimetric Note Only 2 values are needed weight of analyte, A and weight of sam

Question

gravimetric

Note Only 2 values are needed weight of analyte, A and weight of sample. is the analyte Precipitate relationship between but can be converted to corresponding weight of analyte using the the two; analyte precipitate. 1. A 0.3516 g sample of commercial phosphate detergent was ignited at a red heat to destroy the organic matter. The residue was taken up in hot HCl, which converted the P to H3PO4. The phosphate was precipitated as MgNHAPO4 6H20 by addition of Mg2 followed by aqueous NH3. After being filtered and washed, the precipitate was converted to Mg2P207 (222.57) by ignition at 1000 C. This residue weighed 0.216ig. Calculate %P (30.974) in the sample.

Explanation / Answer

No of mol of P present in sample = (0.2161/222.57)*2 = 0.00194 mol

mass of P present in sample = 0.00194*31 =0.06 grams

% of P in sample = 0.06/0.3516*100 = 17.065%

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