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Sulfur dioxide is fairly soluble in water, and by both IR and Raman spectroscopy; the hypothetical sulfurous acid, H 2 SO 3, is not present to any extent. However, such solutions do show spectra of the hydrogen sulfite ion, HSO 3 −, by reaction with water, and it is in fact the actual reducing agent present: SO 2 + H 2 O ⇌ HSO 3 − + H +
Ethanol is used to dissolve many water-insoluble medications and related compounds. Liquid preparations of pain medications, cough and cold medicines, and mouth washes, for example, may contain up to 25% ethanol [42] and may need to be avoided in individuals with adverse reactions to ethanol such as alcohol-induced respiratory reactions. [43]
This acid coagulant is also commonly used together with calcium sulfate to give soft tofu a smooth, tender texture. Other edible acids: Though they can affect the taste of the tofu more, and vary in density and texture, acids such as acetic acid and citric acid (such as lemon juice), can also be used to coagulate soy milk and produce tofu.