Abarium sulfate slurry is ingested before the gastrointestinal tract is x-rayed because it is opaque to x-rays and defines the contours of the tract. barium ions are toxic, but the compound is nearly insoluble. if the ∆g° at 37°c (normal body temperature) is 59.1 kj/mol for the dissociation equilibrium of solid barium sulfate into barium ions and sulfate ions, what is the concentration of the barium ions in the intestinal tract? [assume that the only source of sulfate ions is the ingested slurry].