Equilibrium Constant Lab

Equilibrium Constant Lab - Determination of an Equilibrium...

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Determination of an Equilibrium Constant by Spectrophotometry April 8 th , 2008 Lab Section 2216 Chemistry 002 Yunyun Wu Rebecca Dermody
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Purpose : The purpose of this experiment is to find the value of K, the equilibrium constant, for Fe(SCN) 2+ . The value of K is found through measuring the absorbency of different concentrations of Fe(SCN) 2+ . Procedure: Calibration Curve for Fe(SCN) 2+ : 1. Prepare six 10mL flasks with 2.00 mL of .200 M Fe(NO 3 ) 3 in 0.10 M nitric acid and label flasks 1-6 2. Add 0.00 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 1 3. Add 0.20 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 2 4. Add 0.40 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 3 5. Add 0.60 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 4 6. Add 0.70 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 5 7. Add 1.00 mL 0.00200 M NaSCN in 0.10 M HNO 3 to flask 6 8. Dilute each solution to the mark with 0.10 M HNO 3 9. Tightly stopper flasks and mix the solutions 10.Set wavelength for the spectrophotometer to 447 nm 11. Place 2 mL of blank solution into the cuvette and place cuvette into spectrophotometer to zero the instrument 12. Add 2 mL from flask 1 to cuvette, place in spectrophotometer, and record absorbance 13. Repeat step 12 with flasks 2-6
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Equilibrium Constant Lab - Determination of an Equilibrium...

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