Barium enema is a diagnostic medical procedure in which the inside of the large intestine is coated with an aqueous slurry of insoluble BaSO4 alarm bells because Ba is a heavy metal that’s absorbed throughout the gastrointestinal tract and levels in drinking water as low as 10 mg/L (about 7 x 10–5 M). saline solution that contains 0.137 M NaCl, 0.0027 M KCl, 0.0809 M Na2HPO4 (which dissociates into Na+ and HPO4) and 0.0176 M KH2PO4 (which dissociates into K+ and H2PO4). What’s the ionic strength of this solution, ignoring the contributions of Ba2+ and SO4 that’ll be present?