MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Sulphate ion test. Positive result of a test for sulphate ions in a solution. The solution was acidified with hydrochloric acid and barium chloride solution was added. In the presence of sulphate ions this causes the formation of a white precipitate of barium sulphate.
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