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Sulfurous acid is a weak acid formed when sulfur dioxide gas dissolves in water, and it's commonly used as a preservative and bleaching agent in food and industrial processes. It matters because it plays an important role in food safety and manufacturing, though it can also be a respiratory irritant and environmental concern when released into the atmosphere.
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Sulfurous acid (United Kingdom spelling: sulphurous acid) is the chemical compound with the formula H2SO3.
Raman spectra of solutions of sulfur dioxide in water show only signals due to the SO2 molecule and the bisulfite ion, HSO−3. The intensities of the signals are consistent with the following equilibrium: