Calculateur de Potentiel de Cellule

Calculez le potentiel de cellule d'une pile électrochimique.

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Quotient de réaction (Q)

0.0400

Reaction Quotient (Q) vs Concentration of Product C

Voir la formule →

Formule

Reaction Quotient

Formula

Q = [C]^c × [D]^d / ([A]^a × [B]^b)

Where:

  • Q = reaction quotient
  • [X] = current concentration of species X
  • a, b, c, d = stoichiometric coefficients

    • Compare Q to K:

  • Q < K → reaction proceeds forward (toward products)
  • Q > K → reaction proceeds backward (toward reactants)
  • Q = K → system is at equilibrium

    • Exemple Résolu

    A + B → C + D. Current: [A]=0.5, [B]=0.5, [C]=0.1, [D]=0.1. All coefficients = 1.

    1. 01Q = [C]^c[D]^d / [A]^a[B]^b
    2. 02Q = (0.1)¹(0.1)¹ / (0.5)¹(0.5)¹
    3. 03Q = 0.01 / 0.25
    4. 04Q = 0.04

    Questions Fréquentes

    What is the reaction quotient?

    Q has the same form as the equilibrium expression but uses current (non-equilibrium) concentrations. It tells you which direction the reaction will shift to reach equilibrium.

    How is Q different from K?

    K uses equilibrium concentrations and is a constant at a given temperature. Q uses current concentrations and can have any value.

    What if Q equals K?

    The system is at equilibrium and no net change occurs. Concentrations remain constant (though individual forward and reverse reactions continue).

    Apprendre

    Understanding Molarity

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