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Determination of Phosphates by the Gravimetric Quimociac Technique
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Abstract
The determination of phosphates by the classic quimociac gravimetric technique was used successfully as a laboratory experiment in our undergraduate analytical chemistry course. Phosphate-containing compounds are dissolved in acid and converted to soluble orthophosphate ion (PO43-). The soluble phosphate is easily precipitated as quinoline molybdophosphoric acid by the addition of a single reagent. The precipitate is easily filtered, dried, and weighed. The method has the advantages of producing a predictable, stable, high molar mass precipitate that students find easy to form, filter, dry, and weigh. This technique is well-known for its precision and accuracy. Students can also learn about the formation and structure of 12-heteropoly molybdophosphoric acid.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Analytical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Applications of ChemistryTools
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- Received: August 03, 2009
ACS
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