a)what is the absorptivity coefficient (molar absorptivity) of {Fe (H2o)5 SCN} 2

Question

a)what is the absorptivity coefficient (molar absorptivity) of {Fe (H2o)5 SCN} 2+

b) what is the [{Fe (H2o)5 SCN}2+]eq

c) what are the [{Fe (h2o)6 }3+](aq) & the [SCN-(aq)]eq

d) what is the equilibrium constant for this reaction?

You have determined the equilibrium constant for the reaction between aqueous iron(im and thiocyanate. The equilibrium reaction is given by the equation below. ml of 0.200 M Fe(NO) were mixed with S mL of 0.200M KscN is The absorbance ofthis mixture was 0.2Sand the standard curve for fFe(HosscN)" sted below. Analysis of Fe-SCN equilibrium 02 0.15 DFe-SCN product (M)

Explanation / Answer

From the given data,

(a) molar absorptivity = slope of curve

                                   = 5420 M-1.cm-1

(b) Equilibrium concentration of [Fe(H2)5SCN]2+eq

= absorbance/molar absorptivity

= 0.25/5420

= 4.61 x 10^-5 M

(c) [Fe(H2O)6]3+eq = (0.2 x 5/10) - 4.61 x 10^-5

                                 = 0.0999 M

[SCN-]eq = (0.2 x 5/10) - 4.61 x 10^-5

                = 0.0999 M

(d) Equilibrium constant Keq = [Fe(H2O)5SCN]2+eq/[Fe(H2O)6]3+eq.[SCN-]eq

                                              = 4.62 x 10^-3

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