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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > August  >
In the Laboratory
Determination of Phosphates by the Gravimetric Quimociac Technique
Lee Alan Shaver
Department of Chemistry, Washburn University, Topeka, KS 66621
Cover
August 2008
Vol. 85 No. 8
p. 1097

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.
Supplement
Student handout including laboratory questions; Instructor notes
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Citation
Shaver, Lee Alan. J. Chem. Educ. 2008, 85, 1097.
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Keywords
Analytical Chemistry; Applications of Chemistry; Gravimetric Analysis; Hands-On Learning / Manipulatives; Laboratory Instruction; Quantitative Analysis; Synthesis; Upper-Division Undergraduate
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History
Created:
Last Updated:
6/23/2008
7/2/2008
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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