  We study a problem involving thermosolutal convection in a fluid when the
solute concentration is subject to a chemical reaction in which the solubility
of the dissolved component is a function of temperature. When the spatial
domain is a bounded one in $\mathbb{R}^{2}$ we show that the solution depends
continuously on the reaction rate using true \emph{a priori} bounds for the
solution when the chemical equilibrium function is an arbitrary function of
temperature.
