EquilibriumReactant(std::string name_, MeshLib::PropertyVector< double > *molality_, MeshLib::PropertyVector< double > *molality_prev_, MeshLib::PropertyVector< double > *volume_fraction_, MeshLib::PropertyVector< double > *volume_fraction_prev_, MeshLib::PropertyVector< double > *mesh_prop_molality_, double saturation_index_, std::string reaction_irreversibility_)