Ionic Equations for Concentrated sulfuric acid and Potassium Chloride Watch
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However, the KBr will react with H2SO4 to form KHSO4 and HBr. Bromide ions are strong enough reducing agents to reduce H2SO4 to SO2. Iodide ions can reduce H2SO4 further still to sulphur and even as far as hydrogen sulphide (H2S).