  We use the formalism of Geometrothermodynamics to describe chemical reactions
in the context of equilibrium thermodynamics. Any chemical reaction in a closed
system is shown to be described by a geodesic in a $2-$dimensional manifold
that can be interpreted as the equilibrium space of the reaction. We first show
this in the particular cases of a reaction with only two species corresponding
to either two ideal gases or two van der Waals gases. We then consider the case
of a reaction with an arbitrary number of species. The initial equilibrium
state of the geodesic is determined by the initial conditions of the reaction.
The final equilibrium state, which follows from a thermodynamic analysis of the
reaction, is shown to correspond to a coordinate singularity of the
thermodynamic metric which describes the equilibrium manifold.
