Measuring Equilibrium Constants (HSC SSCE Chemistry): Quizzes

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Measuring Equilibrium Constants
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What must you have before calculating KeqK_{eq} for a reaction?

Balanced equation & concentration data

In which scenario can you calculate KeqK_{eq}?

Initial concs + 1 equilibrium conc

For CO(g)+2H2(g)⇌CH3OH(g)\text{CO}(g) + 2\text{H}_2(g) \rightleftharpoons \text{CH}_3\text{OH}(g), why is [H2][\text{H}_2] squared in KeqK_{eq}?

Coefficient of 2 in equation

What does ICE stand for in the ICE method?

Initial, Change, Equilibrium

What is the Beer-Lambert law equation?

A=εlcA = \varepsilon l c

What is the relationship between absorbance and concentration in the Beer-Lambert law?

Direct proportional (A∝cA \propto c)

Why are non-destructive techniques like colourimetry ideal for measuring equilibrium?

Don't shift equilibrium position

What colour is the FeSCN2+\text{FeSCN}^{2+} complex ion?

Deep red

Why use a large excess of Fe3+\text{Fe}^{3+} when creating the calibration curve?

Ensures all SCN−\text{SCN}^- reacts

For Fe3++SCN−⇌FeSCN2+\text{Fe}^{3+} + \text{SCN}^- \rightleftharpoons \text{FeSCN}^{2+}, how is [Fe3+]eq[\text{Fe}^{3+}]_{eq} calculated?

[Fe3+]initial−[FeSCN2+]eq[\text{Fe}^{3+}]_{initial} - [\text{FeSCN}^{2+}]_{eq}

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Calculating the Equilibrium Constant

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Qualitative Equilibrium

Calculating the Equilibrium Constant

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Qualitative Equilibrium

Calculating the Equilibrium Constant

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