Note 36 bis — Chapter XX · SULPHUR, SELENIUM, AND TELLURIUM
George Kamensky translation
Schwicker (1889) by saturating NaHSO3 with potash, or KHSO3 with soda, obtained NaKSO3, in the first instance with H2O, and in the second instance with 2H2O, probably owing to the different media in which the crystals are formed. In general sulphurous acid easily forms double salts.