## mass-law effect

https://doi.org/10.1351/goldbook.M03725
At equilibrium, the product of the activities (or concentrations) of the reacting species is constant. Thus for the equilibrium: $\alpha\,\text{A}\,+\,\beta\,\text{B}\rightleftharpoons \gamma\,\text{C}\,+\,\delta\,\text{D}$ $K=\frac{\left[\text{C}\right]^{\gamma }\ \left[\text{D}\right]^{\delta }}{\left[\text{A}\right]^{\alpha }\ \left[\text{B}\right]^{\beta }}$