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A dilute hydrochloric acid solution was added to a sample of an unknown solution in a lab. A white precipitate was formed, filtered from the solution, washed with hot water, and then dissolved in a solution of NH3. A few drops of K2SO4 were added to the filtrate and another white precipitate formed. What two ions were precipitated out of solution?

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A dilute hydrochloric acid solution was added to a sample of an unknown solution in a lab. A white precipitate was formed, filtered from the solution, washed with hot water, and then dissolved in a solution of NH3. A few drops of K2SO4 were added to the filtrate and another white precipitate formed. What two ions were precipitated out of solution?






 
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