Testing For Negative Ions

The video tutorial explains how to test for carbonate, sulfate, and nitrate ions. For carbonates, dilute acid is added, and the gas produced is bubbled through lime water, turning it milky if carbonates are present. Sulfates are tested by adding barium chloride, forming a white precipitate of barium sulfate. Nitrates are tested by adding sodium hydroxide and aluminum powder, which reduces nitrates to ammonium ions, releasing ammonia that turns litmus paper blue. The video also covers writing and balancing chemical equations for these reactions.

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