CHEM 06101 Lecture Notes - Lecture 6: Potassium Thiocyanate, Chemical Equilibrium, Cuvette
23 Jul 2018
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Document Summary
This objective of this experiment is to understand the equilibrium in chemical reactions and calculate the. Keq from the results achieved from the lab. In this experiment, we made five solutions of 2. 00 x 10-3 m of. Feno3, 3. 00 x 10-3 m kscn, and 0. 25 m hno3 in different ratio in test tubes and then we have transferred those solutions in cuvettes. Setting spectrometer at 447 wavelength we measured absorbance using five solutions, prepared earlier. As the concentration of kscn was increasing the solution was turning dark orange color from light orange. Filling one cuvette 2/3 full with hno3 to use as a blank to measure the absorbance accurately. As the molarity of scn increases, the absorbance of solution also increase. In this experiment as the volume of hno3 was reducing, volume of kscn increases, which increases the absorbance as the volume of kscn increases. So the kscn works as a catalyst to make reaction faster.
