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Write the Keq for the initial equilibrium of the Fe(No3)3 and the KSCN solutions.

User Wrench
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The Keq expression for the initial equilibrium is:

Keq = [FeSCN²⁺][NO₃⁻] / [Fe³⁺][SCN⁻]

How to write Keq?

The equilibrium reaction between Fe(NO3)3 and KSCN solutions involves the formation of FeSCN²⁺ ions:

Fe³⁺(aq) + SCN⁻(aq) ⇌ FeSCN²⁺(aq) + NO₃⁻(aq)

To write the equilibrium constant (Keq) for this reaction, we follow the general format:

Keq = [Products] / [Reactants] raised to their stoichiometric coefficients.

In this case, the products are FeSCN²⁺ and NO₃⁻, and the reactants are Fe³⁺ and SCN⁻. Their stoichiometric coefficients are all 1. Therefore, the Keq expression for the initial equilibrium is:

Keq = [FeSCN²⁺][NO₃⁻] / [Fe³⁺][SCN⁻]

Keq is a dimensionless constant, so the units of concentration for all the species must be consistent.

User Cjserio
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