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140 3. Recalculate the K, using the equilibrium concentrations in the example on page 2 assuming the reaction was actually: Fe + 2 SCNFe(SCN) (assume the Beer's Law formula is the same.) (aq) ag) K. -s Teaction hature ts pPrepared by combining 15 m009 and 15. 0 mL 0.002 M Fe(NO,),. The resulting solution is placed in a spectrophotometer and the absorbance of light at 447 nm is recorded. Absorbance-0.345 Initial concentrations of the reactants: (using the dilution rule) 15.0 mL 0.002 M 50.0 mL Fe"] - . 6.00 x 104 mole/L [SCN] 20.0 mL x 0.002 M -8.00Ã10-4 mole/L 50.0 mL Equilibrium concentration of [FeSCN]: (using Beer's Law) 0.345 4400 L/mol cmà 1.00 emi 7.84 x 10s mole/L a b Equilibrium concentrations of the reactants: Fe'(a) FeSCN) +SCN 8.00 à 10-4 Initial Change Equilibrium 6.00à 10" 7.84 x 10 5.22 à 10-4 7.84 x 10 +7.84 x 10 7.22 x 104 7.84 à 10-5 EXPERIMENT 14 I SPECTROSCOPY AND THE EQUILIBRIUM CONSTANT POST-LAB QUESTIONS 1. If you failed to consider the dilution effect when determining the initial concentration of the reactants, how would that affect the value of the calculated K,? l tne dilution of the Huo s NOT cousderdt tobel no of solvt.on wond the less makns the i ich ould ultimatly mai Lesser Ifthe volume of one substance in s measurement be different? The calculated K? Explain. \f the ualvwe of a Sulosta.e do v bles 2. ample two was doubled, would the absorbance in 149 EXPERIMENT 14 I SPECTROSCOPY AND THE EQUILIBRIUM CONSTANTS: POST-LAB Show transcribed image text
140 3. Recalculate the K, using the equilibrium concentrations in the example on page 2 assuming the reaction was actually: Fe + 2 SCNFe(SCN) (assume the Beer's Law formula is the same.) (aq) ag) K. -s
Teaction hature ts pPrepared by combining 15 m009 and 15. 0 mL 0.002 M Fe(NO,),. The resulting solution is placed in a spectrophotometer and the absorbance of light at 447 nm is recorded. Absorbance-0.345 Initial concentrations of the reactants: (using the dilution rule) 15.0 mL 0.002 M 50.0 mL Fe"] - . 6.00 x 104 mole/L [SCN] 20.0 mL x 0.002 M -8.00Ã10-4 mole/L 50.0 mL Equilibrium concentration of [FeSCN]: (using Beer's Law) 0.345 4400 L/mol cmà 1.00 emi 7.84 x 10s mole/L a b Equilibrium concentrations of the reactants: Fe'(a) FeSCN) +SCN 8.00 à 10-4 Initial Change Equilibrium 6.00à 10" 7.84 x 10 5.22 à 10-4 7.84 x 10 +7.84 x 10 7.22 x 104 7.84 à 10-5 EXPERIMENT 14 I SPECTROSCOPY AND THE EQUILIBRIUM CONSTANT
POST-LAB QUESTIONS 1. If you failed to consider the dilution effect when determining the initial concentration of the reactants, how would that affect the value of the calculated K,? l tne dilution of the Huo s NOT cousderdt tobel no of solvt.on wond the less makns the i ich ould ultimatly mai Lesser Ifthe volume of one substance in s measurement be different? The calculated K? Explain. \f the ualvwe of a Sulosta.e do v bles 2. ample two was doubled, would the absorbance in 149 EXPERIMENT 14 I SPECTROSCOPY AND THE EQUILIBRIUM CONSTANTS: POST-LAB
Show transcribed image text Beverley SmithLv2
11 May 2019