You are given a solid that is a mixture of sodium sulfate and potassium sulfate. a o.205g sample of the mixture is dissolved in water. An excess of an aqueous solution of barium chloride is added. the barium sulfate tat is formed is filtered, dried, and weighed. its mass is 0.298g. what mass of sulfate ion is in the sample? What is the mass percent of sulfate ion in the sample? what are the percent compositions by mass of sodium sulfate and potassium sulfate in the sample?