Record the value of the equilibrium constant that you determined for this chemic

Question

Record the value of the equilibrium constant that you determined for this chemical system, and write the equilibrium constant expression for this system. Frank and Oswald report a molar absorptivity (epsilon) for FeSCN^2+ of 4700L(mol*cm). Remember that your path length (b) is 1 cm for the Spec-20. Using the absorbance that you measured after adding 1.00 mL of Fe(NO_3)_3 to the reaction mixture, what is the equilibrium concentration for FeSCN^2+ in that first solution? Using your value for K and the [FeSCN^2+] calculated above, and the initial concentrations of Fe^3+ and SCN^- from your results sheet, calculate the equilibrium concentrations for Fe^3+, SCN6- for the system in the first measurement where only 1.00 mL of Fe(NO_3)_3 is added. Are the concentrations you calculated reasonable? Explain based on your value of k.

Explanation / Answer

For queston 2, Q2.

we will need to apply Beer's Law:

which states that absrbance and concentation can be related via:

A = e*l*C

where

A = absorbance

l = path length

C = molar concentration

e = absroptivity constant (given)

we have A, from your experiment, l = 1 cm stated and e = given, 47000

therefore, we just need to solve for C, concentration

C = A/(e*l)

substitute all data, recall that A is dimensionless

C = (0.076)/(4700 L/molcm * 1 cm)

C = 0.00001617021 mol per liter

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