Ferrous zinc sulphate

Ferrous magnesium sulphate,3 Ferrous manganese sulphate2 (very faint pink), and Ferrous zinc sulphate 2> 4 (white, well crystallised) have also been prepared. 

The somewhat remarkable fact that many sulphates when heated retain one molecule of water of crystallisation (called water of constitution ) very persistently, whilst the other molecules are eliminated with relative ease, this phenomenon being observable with copper, manganese, ferrous, nickel, cobalt, magnesium and zinc sulphates, has led to a... 

Copper, Zinc, and Alkali Salts. — Dissolve 5 gm. of ferrous ammonium sulphate in 50 cc. of water, add 5 cc. of nitric acid (sp. gr. 1.3), and boil the solution for a few minutes then add to the liquid 15 cc. of ammonia water, let stand for about one hour, and filter. The filtrate must be colorless (copper). 

Nickelous Sulphate or Nickel Sulphate, NiS04, has been obtained in various stages of hydration. Its solution is prepared by dissolving the hydroxide or carbonate in dilute sulphuric acid. When crystallised at 15-20° C., the heptahydrate, NiS04.7H20, is obtained as green rhombic prisms, isomorphous with the corresponding ferrous and zinc sulphates. Its density 7 is 1-877, and specific heat 0-341. 

Stortenbeker bas also studied the mixed crystals formed by cadmium sulphate and ferrous sulphate by zinc sulphate and magnesium sulphate by magnesium sulphate and ferroiis sulphate by copper sulphate and manganese sulphate by cobalt chloride and manganese chloride. We shall limit ourselves to referring the reader to these valuable memoirs. 

Crystallization by Concentration and Cooling.—There are very many cases in chemical manufacture where the desired product is produced as a practically pure water solution of the substance. This is especially true of metallic salts such as ferrous sulphate, copper sulphate, zinc sulphate, lead acetate, etc. The solutions of these salts are generally concentrated in open evaporators, usually... 

Materials Solutions of sodium chloride, calcium chloride, zinc sulphate, ferrous ammonium sulphate, copper sulphate, arsenic chloride, hydrogen sulphide, ammonium sulphide. 

Directions Put 5 c.c. of solutions of sodium chloride, calcium chloride, zinc sulphate, ferrous ammonium sulphate, copper sulphate, and arsenic chloride into separate test tubes and add 10 c.c. of hydrogen sulphide solution, (either some that you made in Experiment 56, or some of the laboratory reagent) into each. 

Materials Aluminium zinc tin solutions of zinc sulphate, ferrous sulphate, and ammonium sulphide. 

To determine which metal has dissolved proceed as follows After the reaction has taken place for about two minutes pour off the liquid from the tube containing the zinc and add to it a few drops of a solution of ammonium sulphide. (3) What is the color of the precipitate To determine whether the sulphide precipitated is that of iron or zinc add ammonium sulphide to solutions of ferrous sulphate and of zinc sulphate. 

Sphalerite reacts with the dissolved ferric sulphate to produce soluble zinc sulphate and elemental sulphur, with the iron being reduced from the ferric to ferrous state, as in reaction (2). 

The preparation of green vitriol (ferrous sulphate) from roasted pyrites is described there are three kinds of vitriol, blue (from Cyprus or Hungary, copper sulphate), green (from Spa, etc., ferrous sulphate), and white, sold in small cakes and called in France white copperas (couperose blanche) and used as an eye-lotion (zinc vitriol or zinc sulphate) the best is green vitriol, the blue,... 

Metals solution. Manganese sulphate 0 6 per cent, zinc sulphate 1 1 per cent, ferrous sulphate 01 per cent, cobalt sulphate 0 03 per cent, copper sulphate 0 004 per cent, boric acid 0 006 per cent, potassium iodide 0 0001 per cent and EDTA 0-5 per cent. Prepare the solution by first dissolving the EDTA in hot water and then adding the remaining constituents. 

For some non-ferrous metals (copper, lead, nickel) the attack by sulphuric acid is probably direct with the formation of sulphates. Lead sulphate is barely soluble and gives good protection. Nickel and copper sulphates are deliquescent but are gradually converted (if not leached away) into insoluble basic sulphates, e.g. Cu Cu(OH)2)3SO4, and the metals are thus protected after a period of active corrosion. For zinc and cadmium the sulphur acids probably act by dissolution of the protective basic carbonate film. This reforms, consuming metal in the process, redissolves, and so on. Zinc and cadmium sulphates are formed in polluted winter conditions whereas in the purer atmospheres of the summer the corrosion products include considerable amounts of oxide and basic carbonate. ... 

Weather conditions at the time of initial exposure of zinc and steel have a large influence on the protective nature of the initial corrosion products This can still be detected some months after initial exposure. Finally, rust on steel contains a proportion of ferrous sulphate which increases with increase in SO2 pollution of the atmosphere. The effect of this on corrosion rate is so strong that mild steel transferred from an industrial atmosphere to a rural one corrodes for some months as though it was still exposed to the industrial environment. ... 

Procedure Triturate 3.5 g thoroughly with 35 ml DW, fdter and decolorise the filtrate by the addition of a little zinc powder. To 5.0 ml of the filtrate add a few drops of ferrous sulphate solution and 1 ml NaOH solution warm gently and acidify with HC1, no blue colour or green colour is produced. 

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