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Reaction Quotient (Q) Calculator

Chemistry
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Calculates the reaction quotient (Q) to determine the direction a reversible reaction will shift to reach equilibrium.

More tools:Science & Lab Calculators
How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Reactants Concentration, Products Concentration, Reactants Stoichiometric Coefficient, and Products Stoichiometric Coefficient in the units shown.

Step 2

Read Reaction Quotient (Q) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Equal Concentrations, Equal Coefficients

Reactants Concentration: 1 M; Products Concentration: 1 M; Reactants Stoichiometric Coefficient: 1; Products Stoichiometric Coefficient: 1

Reaction Quotient (Q): 1

Products Favored

Reactants Concentration: 0.5 M; Products Concentration: 1.5 M; Reactants Stoichiometric Coefficient: 1; Products Stoichiometric Coefficient: 1

Reaction Quotient (Q): 3

Reactants Favored

Reactants Concentration: 1.5 M; Products Concentration: 0.5 M; Reactants Stoichiometric Coefficient: 1; Products Stoichiometric Coefficient: 1

Reaction Quotient (Q): 0.3333333333

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