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Fe+3 + SCN-
---->
<----
FeSCN+2
You mix the following:
Volume of KSCN solution 4.27 mL
Original concentration of KSCN solution 0.00495 M
Volume of ferric ion solution 4.74 mL
Original concentration of ferric ion solution 0.02488 M
Voluume of distilled water 5.25 mL
You measure the %T of the blank and sample at 447 nm using the samecuvet. Only FeSCN2+ absorbs at 446 nm! KSCN and Fe+3 aretransparent.
%T of blank 100.6
%T of sample 42.7
constant [Molarity FeSCN2+ per absorbance] 0.001264 M/A
Note: This constant is only for this pre-lab
Calculate:
a) Millimoles of SCN- originally put in solution _______________mmoles
b) Millimoles of Fe+3 originally put in solution _______________mmoles
c) Total volume of solution _______________ mL
d) Molarity of FeSCN2+ at equilibrium _______________ M
e) Millimoles of FeSCN2+ at equilibrium _______________mmoles
f) Molarity of SCN- at equilibrium _______________ M
g) Molarity of Fe+3 at equilibrium _______________ M
h) Calculated equilibrium constant _______________
