ERIC Number: EJ925953
Record Type: Journal
Publication Date: 2011-Mar
Pages: 2
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
Colorimetric Determination of the Iron(III)-Thiocyanate Reaction Equilibrium Constant with Calibration and Equilibrium Solutions Prepared in a Cuvette by Sequential Additions of One Reagent to the Other
Nyasulu, Frazier; Barlag, Rebecca
Journal of Chemical Education, v88 n3 p313-314 Mar 2011
The well-known colorimetric determination of the equilibrium constant of the iron(III-thiocyanate complex is simplified by preparing solutions in a cuvette. For the calibration plot, 0.10 mL increments of 0.00100 M KSCN are added to 4.00 mL of 0.200 M Fe(NO[subscript 3])[subscript 3], and for the equilibrium solutions, 0.50 mL increments of 0.00200 M KSCN are added to 4.00 mL of 0.00200 M Fe(NO[subscript 3])[subscript 3. Students are able to complete data collection in about 30 min compared to 1.5 h using the standard procedure. The equilibrium constant is 113 [plus or minus] 3 at [approximately]20 [degrees]C. (Contains 3 tables.)
Descriptors: Chemistry, Science Instruction, Scientific Principles, Science Laboratories, Computation, Science Experiments, Scientific Concepts
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: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A