Solutions in oleum. Part 3.—Cryoscopic behaviour of acids, bases and salts in disulphuric acid

Abstract

The cryoscopic behaviour of boric acid and boric oxide has been studied in disulphuric acid and the results interpreted in terms of the formation of a complex sulphatoboric acid HB(HS₂O₇)₄. This acid appears to be strong in disulphuric acid. In addition, the cryoscopic behaviour of alkali metal chlorides and nitrates is reported and is consistent with the formation of the polyanion HS₃O^–₁₀. 2,4-Dinitrochlorobenzene, 2,4-dinitrotoluene and acetic acid behave as strong bases. In the latter case there appears to be complexing between the protonated acetic acid and SO₃.