2 (1) Would the measured absorbance of an FeNCS2+ ion solution be higher, lower,

Question

2 (1) Would the measured absorbance of an FeNCS2+ ion solution be higher, lower, or unaffected if there were fingerprints on the cuvette? Briefly explain. (2) How would the error described in 2(1) affect calculated FeNCS2+ ion concentration in the solution? Briefly explain. (3)How would the error described in 2(1) affect the calculated Keq? Briefly explain. Briefly explain why you can make the assumption that all of the SCN- ion in solution S2-S6 has converted to FeNCS2+ ion. Verify the assumption described in Question 3. To do so, use your mean 44 to calculate the equilibrium SCN- ion concentration in Solution S6. The initial Fe3+ ion concentration should be 4 .00 X10^-2 M; the initial SCN- ion concentration is recorded on Data Sheet 1. You will have to solve a quadratic equation

Explanation / Answer

2(1) Fingerprints or water spots or any dirt or contaminant on the walls of the cuvette would effect the path of light when such cuvette is placed in spectrophotometer and reflect and scatter the light, lessening the intensity of the transmitted light and thus would result in an error in the reading of absorbance, leading to a higher aborbance than the compound would otherwise exhibit without the fingerprint /contaminant [Note: Transmittance is iversely related to Absorbance)

so measured absorbanc eof FENCS2+ ion would be higher if finger prints are there on the cuvette

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2 (2) Since the absorbance is higher for the ion, its concentration would be recored as higher than it otherwise should be

Absorbance is directly proportional to concentration [Beer Lambert's law]

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2(3)

AB ----------> A+ + B-

Ksp = [A+] [B-]

Ksp solubility product is nothing but product of concentration of the cation and anion that the compound gives

since the concentrations are reflected higher than normal, Ksp also exhibits higher value than it is supposed to be.

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3 and 4 problems: Insufficient data

Unless whole experimental procedure is attached and all the observations are sent, we wont be able to answer them. I apologise :(

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