Final answer:
The question is unclear without context or specific data about the concentrations of Na, Ca, and Mg at the center of Okavango Island. However, the provided reference material outlines how to calculate total ion concentration in aqueous solutions when salts like NaCl and CaCl2 are dissolved in water.
Step-by-step explanation:
The student's question seems to be about the concentration of ions like sodium (Na), calcium (Ca), and magnesium (Mg) at the center of Okavango Island, but the question itself contains a typo and may lack precise details about concentration values or the environmental context. However, based on the reference information provided, we can discuss how total ion concentration in aqueous solutions is determined by the individual ion concentrations when salts like NaCl (sodium chloride) and CaCl2 (calcium chloride) are dissolved in water.
NaCl dissociates in water into two ions (Na+ and Cl−), while CaCl2 dissociates into three ions (Ca2+ and two Cl−). Therefore, if we have a saturated solution of NaCl with a molarity (m) of 6.2, the actual concentration of dissolved species would be 2 × 6.2 m = 12.4 m (Na+ and Cl− combined). For a saturated solution of CaCl2 with a molarity of 5.4, the resulting concentration would be 3 × 5.4 m = 16.2 m (Ca2+ and Cl−).
When considering concentrations of these ions in a specific geographic location, such as Okavango Island, environmental factors would typically influence the concentrations. Without specific data for the Okavango Island's center, the question remains unanswered. Nevertheless, in general, the concentration of ions can vary due to factors like precipitation, evaporation, and geographic features influencing solute accumulation.