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03_Gravimetry-page2 - The best way to see what is going on...

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Unformatted text preview: The best way to see what is going on is to give an overview of the approach. We can then introduce the relative simple calculations with each step. The first premise is that have a sample that contains an analyte of interest. Your goal is to determine the % analyte in the sample Start by weighing out your sample. Next, convert the sample to a measurable form like a ‘pure’ precipitate If the measurable form is the analyte then % analyte = (wt analyte / wt sample) x 100 More often, the measured form contains the analyte along with other materials. The weight of analyte must first be determined using the gravimetric factor. sample Ignition HCl H3PO4 NH3 Mg2+ MgNH4PO4.6H2O 1000oC Mg2P2O7 Now, you’re ready to do the calculations. Formula weights P = 30.97 g/mol Mg2P2O7 = 222.6 g/mol Gravimetric factor mol P in Mg2P2O7 x FW P GF = FW Mg2P2O7 = 0.2783 So P represents to 27.83 of the total weight. ...
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