ERIC Number: EJ1036394
Record Type: Journal
Publication Date: 2014-Aug
Abstractor: As Provided
Yielding Unexpected Results: Precipitation of Ba[subscript3](PO[subscript4])[subscript2] and Implications for Teaching Solubility Principles in the General Chemistry Curriculum
Hazen, Jeffery L.; Cleary, David A.
Journal of Chemical Education, v91 n8 p1261-1263 Aug 2014
Precipitation of barium phosphate from aqueous solutions of a barium salt and a phosphate salt forms the basis for a number of conclusions drawn in general chemistry. For example, the formation of a solid white precipitate is offered as evidence that barium phosphate is insoluble. Furthermore, analysis of the supernatant is used to illustrate the concept of limiting reagent. In this paper, we present X-ray diffraction and gravimetric evidence that nabaphite is the species formed when aqueous solutions of barium and phosphate are mixed. In addition, our evidence suggests that nabaphite converts to barium apatite before barium phosphate is ultimately observed. This barium phosphate chemistry has implications when teaching solubility principles in general chemistry.
Descriptors: Science Instruction, Chemistry, Science Curriculum, Scientific Principles, College Science, Undergraduate Study, Science Laboratories, Laboratory Experiments, Teaching Methods
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: firstname.lastname@example.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A