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DETERMINING AN EQUILIBRIUM CONSTANT USING SPECTROPHOTOMETRY Determining an Equilibrium Constant Using Spectrophotometry Natalia Velazquez Lopez 18 July 2019 Results Table 1. Determination of an Equilibrium Constant Molarity of stock KSCN solution (M) 2.00 x 10 -3 Volume of stock KSCN solution used (L) 0.01 L Molarity of diluted KSCN solution (M) 2.00 x 10 -4 Molarity of Fe(NO 3 ) 3 solution (M) 1.00 x 10 -1 Table 2. Total Volume of Fe(NO 3 ) 3 added (mL) Absorbance [Fe*] [SCN*] [Fe(SCN) 2+ ] 1.00 0.013 9.90 x 10 -4 1.98 x 10 -4 2.77 x 10 -6 2.00 0.060 1.90 x 10 -3 1.96 x 10 -4 1.28 x 10 -5 3.00 0.096 2.91 x 10 -3 1.94 x 10 -4 2.04 x 10 -5 4.00 0.125 3.84 x 10 -3 1.92 x 10 -4 2.66 x 10 -5 5.00 0.148 4.76 x 10 -3 1.90 x 10 -4 3.14 x 10 -5 6.00 0.162 5.66 x 10 -3 1.89 x 10 -4 3.45 x 10 -5 7.00 0.183 6.54 x 10 -3 1.87 x 10 -4 3.89 x 10 -5 8.00 0.206 7.40 x 10 -3 1.85 x 10 -4 4.38 x 10 -5 9.00 0.220 8.25 x 10 -3 1.83 x 10 -4 4.68 x 10 -5 10.0 0.235 9.09 x 10 -3 1.82 x 10 -4 5.00 x 10 -5 Table 3. Mixture [Fe 3+ ] = [Fe*] -[Fe(SCN) 2+ ] [SCN - ] = [SCN*] – [Fe(SCN) 2+ ] K 1 9.87 x 10 -4 1.95 x 10 -4 14.39 2 1.95 x 10 -3 1.83 x 10 -4 35.87
DETERMINING AN EQUILIBRIUM CONSTANT USING SPECTROPHOTOMETRY

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