Reaction quotient Q calculator

Q from partial pressures or concentrations for aA + bB ⇌ cC + dD pattern.

Calculator

Model / formula

Q = [C]^c[D]^d / ([A]^a[B]^b) (concentrations in mol/L; exponent 0 → factor 1)

[A]

[B]

[C]

[D]

$$Q = \frac{[C]^c [D]^d}{[A]^a [B]^b}$$

Same form as K but with non-equilibrium values. Compare Q to K for direction.

Educational use only. Double-check values for labs, homework, and exams.