Other yeasts are stated to form sulphurous acid in must and wort.
The solution of the gas in water is used under the name of sulphurous acid.
There are various haloid derivatives of sulphurous acid.
and of iodine and sulphurous acid to the estimation of copper and many other substances by Robert Wilhelm Bunsen, marks an epoch in the early history of volumetric analysis.
With iodine compounds, iodic acid is likely to be formed, and hence the solution must be reduced with sulphurous acid before precipitation with silver nitrate.