Reaction quotient
= Reaction quotient
{title2=$Q=\prod_i a_i^{\nu_i}$}
For a <chemical reaction> with signed <stoichiometric vector> entries $\nu_i$, positive for products and negative for reactants, the reaction quotient is the product of the species' <thermodynamic activities> raised to these powers. It equals the <equilibrium constant> at <chemical equilibrium>, with all quantities using the same <standard state> convention.