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Chemistry · Grades 10–12

Simple equilibrium ratio

For the stated A ⇌ B model, use equilibrium concentrations. Other equations require different powers and expressions.

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Rule and assumptions

For the stated A ⇌ B model, use equilibrium concentrations. Other equations require different powers and expressions.

Kc = [B]/[A] for A ⇌ B

Worked examples

For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 2.3 and [B] = 2.4 mol/L. Find Kc. Round to 3 decimal places if needed.

Kc = [B]/[A] for A ⇌ B 2.4/2.3 = 1.043

1.043

For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 3.5 and [B] = 5 mol/L. Find Kc. Round to 3 decimal places if needed.

Kc = [B]/[A] for A ⇌ B 5/3.5 = 1.429

1.429

Try two questions

  1. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 1.7 and [B] = 0.4 mol/L. Find Kc. Round to 3 decimal places if needed.

  2. For A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 1 and [B] = 5.8 mol/L. Find Kc. Round to 3 decimal places if needed.

Answers and reasoning

Answers and marking notes
  1. 0.235

    Kc = [B]/[A] for A ⇌ B 0.4/1.7 = 0.235

  2. 5.8

    Kc = [B]/[A] for A ⇌ B 5.8/1 = 5.8

Further reading and review references

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