<P> When the only equilibrium is that of the formation of a 1: 1 adduct as the composition of a mixture, there are any number of ways that the composition of a mixture can be calculated . For example, see ICE table for a traditional method of calculating the pH of a solution of a weak acid . </P> <P> There are three approaches to the general calculation of the composition of a mixture at equilibrium . </P> <Ol> <Li> The most basic approach is to manipulate the various equilibrium constants until the desired concentrations are expressed in terms of measured equilibrium constants (equivalent to measuring chemical potentials) and initial conditions . </Li> <Li> Minimize the Gibbs energy of the system . </Li> <Li> Satisfy the equation of mass balance . The equations of mass balance are simply statements that demonstrate that the total concentration of each reactant must be constant by the law of conservation of mass . </Li> </Ol> <Li> The most basic approach is to manipulate the various equilibrium constants until the desired concentrations are expressed in terms of measured equilibrium constants (equivalent to measuring chemical potentials) and initial conditions . </Li>

If more products are present in a mixture what can be said of the reversible reaction