Potassium hydrogen sulphite

Carboxylalkyltellurium trichlorides, obtained by the reaction of tellurium tetrachloride with carboxylic acid anhydrides, are reduced to the corresponding ditellurides with potassium hydrogen sulphite. - ... 

This reagent, together with potassium hydrogen sulphite,has been used to reduce aryltellurium trichlorides since the early period of tellurium chemistry, and continues to find wide application. 

A similar formation of trithionate can be effected by recrystallising a mixture of potassium thiosulphate and potassium hydrogen sulphite in aqueous solution.5 It is probable that the method by which potassium trithionate was first prepared depended on the same reaction.6 Potassium hydrogen sulphite solution was warmed with sulphur for several days, with the result that sulphate, thiosulphate and trithionate were obtained, the formation of the last-named in all probability occurring by way of the thiosulphate. 

From Sulphites Potassium hydrogen sulphite, when kept in aqueous solution for a long time with exclusion of air, undergoes spontaneous change with formation of sulphate and trithionate.3 The change, which is commonly represented as... 

Trithionate is also produced when sulphur dioxide is passed into a mixture of solutions of potassium sulphide and potassium hydrogen sulphite 4... 

Hydroxylamine-trisulphonic Acid.7—The potassium salt of this acid is formed by the interaction of potassium hydrogen sulphite and potassium nitrosodisulphonate, according to the equation ... 

Selenotrithionic Acid, H2SeS20B.—In the preparation of potassium selenosulphate as just described, a certain small amount of a potassium selenotrithionate, K2SeS2O0, is obtained, which generally crystallises first on evaporation of the solution at the ordinary temperature. The yield is much better if potassium hydrogen sulphite is also present with the selenium and normal potassium sulphite.2... 

The trisulphide reacts with sulphur dioxide at temperatures between 300° and 800° C. to form sulphur and a sulphate,10 whilst if the sulphide is digested with an aqueous solution of sulphur dioxide, or of potassium hydrogen sulphite, it dissolves and the solution when boiled evolves... 

Potassium Hydrogen Chlorosrnisulphite, 0sCl4(S03)4KeH2, obtained by the prolonged action of potassium hydrogen sulphite on potassiimi osmichloride, crystallises in dark red, monoclinic prisms. When heated with hydrochloric acid it evolves sulphur dioxide, and is converted into potassium osmichloride. 

Schwicker s procedure for making the compounds was to neutralize potassium hydrogen sulphite with sodium carbonate, and sodium hydrogen sulphite with potassium carbonate. The first isomeride is represented as potassium sodio-sulphonate, and crystallizes with two molecules of water the second is assumed to be sodium potassio-sidphonaie, and crystallizes with one molecule of water. 

Potassium hydrogen sulphite, KHS03.—The primary sulphite can be precipitated in monoclinic crystals by addition of alcohol to a solution of potassium carbonate into which excess of sulphur dioxide has been passed. It is unstable, readily losing sulphur dioxide. Its heat of formation in aqueous solution is 211-3 Cal.8... 

Potassium ferri-sulphite, KFe(S03)S04, is prepared by the action of potassium hydrogen sulphite upon ferric ammonium alum. It crystallises in slender needles, which are sparingly soluble in cold water. With hot water, ferrous and potassium sulphates pass into solution, leaving an insoluble yellow residue. 

Salicylic Aldehyde, HO.C6H4.CHO(l, 2), occurs in the oil of spiroea, which is obtained from the blossoms of the meadowsweet. It is prepared from phenol by the Tiemann-Reimer reaction. Salicylic aldehyde is a liquid with a pleasant odor, which is volatile with steam and boils at 196.5°. It shows the properties of a phenol and an aldehyde it gives a violet coloration with ferric chloride, and forms an addition-product with potassium hydrogen sulphite, but does not reduce Pehling s solution. 

Fischer discovered phenylhydrazine in 1875. Strecker by treating diazobenzene nitrate with excess of potassium hydrogen sulphite, obtained a salt... 

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