Activity 7 | Equilibrium Constant

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6 Terms

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What values are plotted on the x-axis in a Beer's Law plot?

Concentration

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What values are plotted on the y-axis in a Beer's Law plot?

Absorbance

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Equilibrium constant (Keq)

A ratio of the product concentrations raised to their stoichiometric coefficients divided by the reactant concentrations raised to their stoichiometric coefficients

Keq = [FeSCN²] / ([Fe][SCN]).

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Change in concentration (x)

Represents the equilibrium concentration of FeSCN²

Represents the amount of Fe and SCN that have been consumed to form FeSCN² at equilibrium

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UV-Vis Spectroscopy

Used to measure the absorbance of the red-colored FeSCN²+ complex, which is directly related to its concentration. By measuring the absorbance, the concentration of FeSCN² can be determined

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Beer’s Law

The absorptive capacity of a dissolved substance is directly proportional to its concentration in a solution

A = εcl

A = absorbance

ε = molar concentration

l = pathlength