The Bunsen Reaction is a chemical reaction that describes water, sulfur dioxide, and iodine reacting to form sulfuric acid and hydrogen iodide. This reaction is the first step in the sulfur-iodine cycle to produce hydrogen.
- 2H2O + SO2 + I2 → H2SO4 + 2HI
The reaction is named after Robert Bunsen.
A similar reaction is the basis for Karl Fischer titration.
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