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Why do we assume that the equilibrium concentration [Fe(SCN)2+] is equal to the initial concentration of...

Why do we assume that the equilibrium concentration [Fe(SCN)2+] is equal to the initial concentration of [SCN-]?

Equation: SCN- + Fe3+ ⇌ Fe(SCN)2+

This was an experiment about determinating the equilibrium constant.

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Answer #1

If the concentration of the reactant iron(lll) nitrate is increased .200M so as to become much larger than the thiocyanate anion Concentration .00200M. now the reaction will be forced almost completely to product side as per lechatliers principle iron(lll) concentration is 100 times that of thiocyanate ion.Therefore essentially all the SCN-- anion will react to produce the red coloured complex.Fe(SCN)2+. So within the limits of detection apparatus the final concentration Fe(scn)2+ is equal to initial concentration of SCN--.

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