Ferric chloride sulphate

Tantalum has excellent resistance to virtually all salts including chlorides (especially cupric and ferric chloride), sulphates, nitrates and salts of organic acids, provided (a) they do not contain fluorides, fluorine and free sulphur trioxide, or (b) hydrolyse to produce strong alkalis. 

Ferric orthoarsenite cannot be prepared directly from ferric hydroxide and arsenious oxide.4 The brown product obtained by shaking freshly precipitated ferric hydroxide with an aqueous solution of arsenious oxide has been described 5 as a basic ferric arsenite of composition 4Fe203.As203.5H20. A similar substance is obtained by adding aqueous arsenious oxide or sodium arsenite to ferric acetate solution. If ferric chloride, sulphate or nitrate is used, the ferric salt is not completely precipitated. The product is oxidised in moist air, and decomposes when heated. It is very doubtful whether this is a chemical individual, however, for it has been shown that the removal of arsenious oxide from the solution by the ferric hydroxide is due to adsorption, the amount removed depending upon the conditions and the age of the adsorbent. This subject is discussed more fully on p. 154. 

Anhydrous cupric sulphate is white but forms a blue hydrate and a blue aqueous solution. The solution turns yellow when treated with concentrated hydrochloric acid, dark blue with ammonia, and gives a white precipitate and brown solution when treated with potassium iodide. A yellow-brown aqueous solution of ferric chloride becomes paler on acidification with sulphuric or nitric... 

Add about 0 2 g. of ferrous sulphate crystals to the first portion of the filtrate contained in a boiling-tube. An immediate dark greenish-grey precipitate of ferrous hydroxide should occur if the mixture remains clear, add a few ml. of sodium hydroxide solution. Now boil the mixture gently for a few minutes to ensure formation of the ferrocyanide, cool under the tap, add one drop of ferric chloride solution, and then acidify... 

Cool the remainder of the filtrate and extract three times with ether, using 20 - 30 ml. for each extraction. Dry the combined ethereal extracts over powdered anhydrous sodium sulphate. Filter into a small flask and distil off the ether on a water-bath. Pour the residual oil into a small dish or beaker crystallisation takes place almost immediately. The salicyl alcohol so obtained is almost pure, but it may, if so desired, be recrystallised from a small quantity of benzene. It is a colourless crystalline solid, m.p. 86 , readily soluble in water it gives a violet coloration with ferric chloride. 

Many salts which are corrosive towards unalloyed iron because of their tendency to hydrolyse to release acid, e.g. calcium and zinc chlorides, are not dangerous to high-chromium irons. The more corrosive salts, typified by aluminium sulphate and ferric chloride, are, however, corrosive to high-chromium irons. Hot aluminium sulphate solutions can give corrosion rates greater than 1 27 mm/y although cold solutions corrode the alloys at rates not exceeding 0-127 mm/y. 

Aluminium sulphate Ammonium bifluoride Ammonium bisulphite Ammonium bromide Ammonium persulphate Antimony trichloride Beryllium chloride Cadmium chloride Calcium hypochlorite Copper nitrate Copper sulphate Cupric chloride Cuprous chloride Ferric chloride Ferric nitrate... 

Thin-layer chromatography has been used by Foppiano and Brown229 to assay the total neomycin B and C content of neomycin sulphate. The neomycin zone was scraped off the plate and reacted with orcinol/ferric chloride reagent, the absorbance of the resulting colour being measured at 665nm. By this procedure a precision of - 2% was achieved. 

Coagulants/ Flocculants Ferric chloride, ferric sulphate, polyelectrolytes... 

Hydrofluoric acid like water is an associated liquid, and even the gas, as we shall soon see, is associated. It has the power of uniting with fluorides. It also seems to be an ionizing solvent for a soln. of potassium fluoride in liquid hydrogen fluoride is an excellent conductor it also possesses marked solvent powers. According to E. C. Franklin,7 the liquid readily dissolves potassium fluoride, ehloride, and sulphate sodium fluoride, bromide, nitrate, chlorate, and bromate acetamide and urea. The solvent action is not so marked with barium fluoride, cupric chloride, and silver cyanide while calcium and lead fluorides copper sulphate and nitrate ferric chloride, mercuric oxide, and magnesium metal, are virtually insoluble in this menstruum. Glass also is not affected by the liquid if moisture be absent. The liquid scarcely acts on most of the metals or non-metals at ordinary temp., though it does act on the alkali metals at ordinary temp., much the same as does water, with the simultaneous production of flame. 

A mixture of hydrazine sulphate and potassium bromide is an efficient substitute for stannous chloride in the prevention of the decomposition of hydrogen sulphide by ferric chloride.10... 

Heated with concentrated sulphuric acid, perthioeyanic acid gives sulphur dioxide, carbon dioxide, thiourea, thiocyanic acid and ammonium sulphate. Heated with chlorine the acid gives cyanogen chloride, sulphur chloride, hydrogen chloride and a reddish-brown insoluble residue. Ferric chloride gives a coloration similar to that produced with thiocyanic acid.10... 

Cyanogen, Chlorine, and Bromine.—Shake 0.5 gm. of powdered iodine with 20 cc. of water, and filter. To 10 cc. of the filtrate, add, drop by drop, decinormal sodium thiosulphate solution until decolorized, then add a granule of ferrous sulphate, 1 drop of ferric chloride solution and 2 cc. of sodium hydroxide solution. Warm to about 60° C., and add 10 cc. of hydrochloric acid. The liquid should not acquire a blue color. Filter, and to 10 cc. of the filtrate add 1 cc. of ammonia water, 5 drops of silver nitrate solution, and again filter. On adding to the filtrate 2 cc. of nitric acid no precipitate, and not more than an opalescent turbidity, should develop. ... 

Sulphates. — Dissolve 10 gm. of ferric chloride in 100 cc. of water, add 25 cc. of ammonia water, filter, acidulate the filtrate with acetic acid, and add barium chloride solution. No precipitate of barium sulphate should form on standing twelve hours. 

Cyanides. — On adding to 20 cc. of the 1 20 aqueous solution a granule of ferrous sulphate, 1 drop of ferric chloride solution, and 5 cc. of sodium hydroxide solution (sp. gr. 1.3), then heating the mixture to 50 to 60° C., and adding 10 cc. of hydrochloric acid, no blue color should develop. 

Periodic coagulation of arsenic trisulphide has been effected by diffusing a solution of ferric chloride or of aluminium sulphate into the sol contained in an agar gel.3... 

Reaction LIX. Reduction of a Primary Aryl Hydrazine to the corresponding Hydrocarbon by the action of Copper Sulphate or Ferric Chloride. 

B., 18, 90, 786.) When a primary aryl hydrazine is boiled with neutral copper sulphate or ferric chloride, or treated with alkaline copper sulphate in file cold, the hydrazine radical is replaced by hydrogen, the corresponding aryl hydrocarbon being formed. 

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