Determination of the Equilibrium Constant Kc by Spectrophotometry: A Comprehensive Study of the Reaction Between Iron(III) and Thyocyanate Ions
DOI:
https://doi.org/10.26438/ijsrcs.v12i1.182Keywords:
equilibrium constant, Le Chatelier’s principle, iron (III) ions, thiocyanate ions, spectrophotometryAbstract
Iron (III) thiocyanate complex ion [FeSCN]2+ is a complex with a deep red color and is formed by the reaction between trivalent iron ions (Fe3+) and thiocyanate ions (SCN-). In the present study, solutions of Fe3+ and HSCN with known concentrations were used and the equilibrium constant KC of the reaction was calculated so that it can be estimated where the chemical equilibrium is shifted. By measuring the absorption of the compound at the maximum wavelength (λmax), the concentrations of [Fe3+], [HSCN], and [FeSCN]2+ in the chemical equilibrium were determined. The results found for KC, indicated that the chemical equilibrium is shifted to the right, meaning the amount of products exceeded the amount of the reactants in all cases.
References
D.G. Themelis, “Βασικές Αρχές Αναλυτικής Χημείας [Basic Principles of Analytical Chemistry]”, 5th Edition, Ziti Publications, Greece, pp.102-123, 2018
N.D. Hatziliadis, “Εισαγωγή στην Ανόργανη και Γενική Χημεία [Ιntroduction to Inorganic and General Chemistry]”, 2nd Edition, Zorzos & SIA Publications, Greece, pp.97-102, 2010
J.Q. Pardo, “Do the Equilibrium Constants Have Units? A Discussion on How General Chemistry Textbooks Calculate and Report the Equilibrium Constants,” International Journal of Physics and Chemistry Education, Vol.11, No.3, pp.73-83, 2019
S. Bose, “High Temperature Coating”, 1st Edition, Butterworth-Heinemann Publisher, USA, pp. 5-16, 2007
J. Tan, K.S. Chan, “Understanding Advanced Physical Inorganic Chemistry, The learner's approach”, 1st Edition, WS Education Publications, Singapore, pp.229-255, 2011
T.P.Hatziioannou, “Χημική Ισορροπία και Ανόργανη Ποιοτική Ημιμικροανάλυση [Chemical Equilibrium, and Inorganic Qualitative Semi-microanalysis]”, 1st Edition, Dora Mavrommati Publications, Greece, pp.64, 69-76, 1993
E. Keszei, M.G. Takacs, B. Vizkeleti, “a Straightforward Method to Determine Equilibrium Constants from Spectrophotometric Data,” Journal of Chemical Education, Vol.77, No.7, pp.927, 2000
W.A.E. Mcbryde, “Spectrophotometric Determination of Equilibrium Constants in Solution”, Talanta, Vol.21, No.10, pp.979-1004, 1974
T.P. Hatziioannou, M.A. Kouppari, “Ενόργανη Ανάλυση [Instrumental Analysis]”, 7th Edition, D. Mavrommati Publications, Greece, pp.20-24, 168-172, 2010
R. Rammete, “Equilibrium Constants from Spectrophotometric Data: Principles, Practice, and Programming”, Journal of Chemical Education, Vol.44, No.11, pp.647-754, 1967
M. Clugston, R. Flemming, “Advanced Chemistry,” 1st Edition, Oxford University Press Publications, Malaysia, pp.164-174, 2000
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors contributing to this journal agree to publish their articles under the Creative Commons Attribution 4.0 International License, allowing third parties to share their work (copy, distribute, transmit) and to adapt it, under the condition that the authors are given credit and that in the event of reuse or distribution, the terms of this license are made clear.
