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ERIC Number: EJ925953
Record Type: Journal
Publication Date: 2011-Mar
Pages: 2
Abstractor: As Provided
Reference Count: 7
ISSN: ISSN-0021-9584
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.)
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:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A