Reaction Quotient Calculator
Shows which way a mixture will move to reach equilibrium.
Reaction quotient Q
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The reaction will —
Q ÷ K —
Reading this —
The formula
Q = [C]^c [D]^d ÷ ([A]^a [B]^b)
The same expression as K, using the concentrations right now rather than at equilibrium.
What to watch out for
If Q is below K there is too little product, so the reaction runs forwards. If Q is above K, it runs backwards.
Frequently Asked Questions
What is the difference between Q and K?
K uses equilibrium concentrations and is fixed at a given temperature. Q can use any concentrations and changes as the reaction runs.
What happens with Q of 0.04 and K of 64?
Q ÷ K is 6.250 × 10⁻⁴, far below 1, so the reaction moves forwards.