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A student thought their unknown was the sulfate ion since no visible reaction occurred after adding...

A student thought their unknown was the sulfate ion since no visible reaction occurred after adding sulfuric acid. How could the student confirm sulfate as the unknown?
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Answer #1

Sulphate ion presence may be confirmed by adding barium chloride solution to the sulphate solution which gives a white barium sulphate precipitate and this precipitate solubility is tested with diluted and concentrated hydrochloric acid both. The precipitate remains insoluble in both.

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