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ERIC Number: EJ829099
Record Type: Journal
Publication Date: 2008-Aug
Pages: 2
Abstractor: As Provided
Reference Count: 12
ISSN: ISSN-0021-9584
Determination of Phosphates by the Gravimetric Quimociac Technique
Shaver, Lee Alan
Journal of Chemical Education, v85 n8 p1097-1098 Aug 2008
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 (PO[subscript 4][superscript 3-]). 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. (Contains 1 figure.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A