Reaction Quotient Calculator

Find the reaction quotient Q from concentrations.

Reaction quotient (Q) 2

Formula: Q = [products] ÷ [reactants]

Step-by-step with your numbers:

1. Values used:

2. Product concentration = 0.4 M

3. Reactant concentration = 0.2 M

5. Reaction quotient (Q) = Product concentration / Reactant concentration = 0.4 / 0.2 = 2

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Q compares current concentrations to predict which way a reaction will shift.

The math behind it

Q = [products] ÷ [reactants] (raised to their coefficients). Compare Q with K: Q<K shifts forward, Q>K reverse.

0.4 ÷ 0.2 → Q = 2.

Q vs K?

At equilibrium Q equals the equilibrium constant K.