Bunsen reaction

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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.