Abstract
S reacts with aqueous NaOH to form sodium sulfide and sodium thiosulfate; in the presence of excess S the polysulfide complex ion S <sub>x</sub> = forms, where "x" is approximately 5. The saturation concentrations of S in aqueous NaOH solutions allowed to react with excess of orthorhombic S have been determined at 25 degrees C. and one atmosphere pressure. Inasmuch as alkaline aqueous solutions are known to exist in nature, the reaction of S with NaOH solutions suggests a possible mode of origin of natural sodium polysulfide and thiosulfate solutions. Alkaline aqueous solutions encountering elemental S would react to produce sodium polysulfide and sodium thiosulfate, substances which are capable of forming soluble complex ions with ore-forming substances.
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