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Topic 7.9 · Introduction to Le Châtelier’s Principle

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AP Chemistry · Topic 7.9: Introduction to Le Châtelier’s PrincipleOpen topic

Original PrepAtlas question. This is not an official College Board question.

For Fe3+(aq) + SCN−(aq) ⇌ FeSCN2+(aq), only the complex contributes appreciably to red absorbance at the chosen wavelength. A small amount of concentrated SCN− solution is added with negligible volume change. What is expected after re-equilibration?

AThe red absorbance decreases because added reactant consumes the complex.BAll Fe3+ must disappear completely.CThe red absorbance increases as additional complex forms.DNo change is possible because the original solution was at equilibrium.

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Topic 7.9 · Introduction to Le Châtelier’s Principle

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