eq experiment - Measurement of Equilibrium Constant Connie...

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Unformatted text preview: Measurement of Equilibrium Constant Connie Jamieson G00458510 10/6/2011 Chemistry 212 section 205 TA: Tiffany Ha Lab partner: Andrew Cedeno Calculations: Initial concentration (NCS) 1- solution #4: M 2 = = Initial concentration of Fe 3+ solution #4: Equilibrium concentration [Fe(NCS)] 2+ = 0.231= 5656.9x - 0.0367 x= 4.73x10-5 Equilibrium concentration Fe 3+ (M) = 3.6 x 10-4 – 4.73x10-5 = 3.1 x 10-4 Equilibrium concentration (NCS) 1- (M) = 8.9 x 10-4 – 4.73 x 10-5 = 8.4 x 10-4 K c = Initial concentration (NCS) 1- solution #5: M 2 = = Initial concentration of Fe 3+ solution #5: Equilibrium concentration [Fe(NCS)] 2+ = 0.247=5656.9x - 0.0367 x= 5.02x10-5 Equilibrium concentration Fe 3+ (M)= 3.6x10-4 – 5.02x10-5 = 3.1 x 10-4 Equilibrium concentration (NCS) 1- (M) = 0.0011 – 5.02x 10-5 = 0.0010 K c = Initial concentration (NCS) 1- solution #6: M 2 = = Initial concentration of Fe 3+ solution #6: Equilibrium concentration [Fe(NCS)] 2+ = 0.194 = 5656.9x - 0.0367 x= 4.08 x10-5 Equilibrium concentration Fe 3+ (M)= x 10-4 – 4.08 x10-5 = 6.7 x 10-4 Equilibrium concentration (NCS) 1- (M) = x 10-4 – 4.08 x 10-5 = 3.2 x 10-4 K c = Theoretical K c = 127.5 Percent error: % Concentration of Fe(NCS) vers Absorbance in nm Solution # Total volume (ml) Initial Volume (ml) of Fe(NO 3 ) 3 (1.0 x 10-4 M) Initial Concentration (M) [Fe(NCS)] 2+ % Transmittance (%T) 450nm A = -log(%T/100) 450nm 1 10.0 1.00 0.00001 100 0.000 2 10.0 2.00 0.00002 81.4 0.0894 3 10.0 3.00 0.00003 70.6 0.1512 4 10.0 4.00 0.00004 64.0 0.1938 5 10.0 5.00 0.00005 58.8 0.2306 Table 1 Figure Conclusion: The purpose of this experiment was to determine the equilibrium constant (k c ) spectrophotometrically for the reaction of hydrated ferric ion (Fe 3+ ) and thiocyanate ion (NCS) 1- . The reaction formed thiocyanate complex ion [Fe(NCS)] 2+ . The equation for the experiment was: [Fe(H 2 O) 6 ] 3+ (NO 3 ) 3 + Na(NCS) [Fe(H 2 O) 5 (NCS)](NO 3 ) 2 + H 2 O + NaNO 3 The net equation was: [Fe(H 2 O) 6 ] 3+ + (NCS) 1- [Fe(H 2 O) 5 (NCS)] 2+ + H 2 O (colorless) (colorless) (red) The equation without water ligands:...
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eq experiment - Measurement of Equilibrium Constant Connie...

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