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
1000oC Mg2P2O7 Now, you’re ready to do the calculations.
= 30.97 g/mol
Mg2P2O7 = 222.6 g/mol
mol P in Mg2P2O7 x FW P
So P represents to 27.83 of the total weight. ...
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- Fall '08
- Kilogram, analyte, 222.6 g, 30.97 g