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Bulletin of Pure and Applied Sciences-Chemistry (Started in 1982)
eISSN: 2320-320X
pISSN: 0970-4620
Impact Factor: 6.991 (2018)
DOI: 10.5958/2320-320X
Editor-in-Chief:  Dr. Pruthviraj. R.D.
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Article Details

Bulletin of Pure and Applied Sciences-Chemistry (Started in 1982)
Year : 2020, Volume & Issue : BPAS-Chemistry 39C(1), JAN-JUN 2020
Page No. : 14-20, Article Type : Original Aticle
Article DOI : 10.5958/2320-320X.2020.00002.3 (Received on 17.11.2019 Accepted on 21.03.2020)

Spectrophotometric Determination of Equilibrium Constant

Atri D. Tripathi1* Navneet Kumar2
Author’s Affiliation : 1, 2 Dept. of Chemistry, Faculty of Engineering, Teerthanker Mahaveer University, Moradabad, Uttar Pradesh 244001, India.

Corresponding Author : Atri D. Tripathi, Dept. of Chemistry, Faculty of Engineering, Teerthanker Mahaveer University, Moradabad, Uttar Pradesh 244001, India. ,
E-Mail:-[email protected]


Abstract

The main purpose of the experiment is to obtain Keq's value of an unknown solution. It was obtained by means of a calibration graph by plotting the concentration of FeSCN2+ ions vs. its absorbance. Formed the best fit line acted as the graph of calibration. The unknown solution's measured absorbance was then plugged into the y variable in the best fit line equation in order to get the concentration of FeSCN2+ at equilibrium. The concentration of FeSCN2+ at equilibrium was subtracted to the initial concentrations of Fe3+ and SCN- for finding equilibrium in their respective concentrations. Keq was calculated by the ratio of the product concentration and the reactant concentration of the reaction to their stoichiometric coefficients.   

Keywords

Spectrophotometer, Equilibrium Constant, Calibration, Absorption, Standard Solutions.
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