This possibility recalls the recent observations of Ballo, who, by acting with a ferrous salt on tartaric acid, obtained a neutral colloid substance having the constitution of arabin, C6 H10 O6.
To appreciate the difficulty of arriving at a correct conclusion, it must be remembered that the silver precipitate is obtained saturated with strong solutions of ferric and ferrous citrate, sodium citrate, sulphate, etc.
The precipitated lilac blue substance (obtained by reducing silver citrate by ferrous citrate) was thrown on a filter and cleared of mother water as far as possible with a filter pump.
The ferrous solution, used for reducing the silver citrate, had been brought to exact neutrality with sodium hydroxide.
The addition of potassium ferricyanid solution does not produce any blue coloration, thus demonstrating the absence of ferrous chlorid (iron protochlorid).
A grain or two of pure ferroussalt (ammonio-ferrous sulphate will do), and the same quantity of uranium nitrate, are dissolved in half an ounce of water.
Ferricyanide solutions give with ferrous salts a deep blue precipitate; with ferric salts a dark-brown coloration.
Soluble ferrocyanides give, with pureferrous sulphate, a white precipitate turning blue in air; with ferric chloride a precipitate of Prussian blue; with cupric sulphate a maroon precipitate.
Some hydrated ferric oxide was hurriedly made from common green vitriol (ferrous sulphate) and ammonia: the washed precipitate was administered in successive teaspoonfuls.
Sulphuretted hydrogen does not interfere with this test, as the black ferrous sulphide dissolves in hydrochloric acid.
A moderately dilute solution of an alkali, such as potash, lime or washing soda, along with a little ferrous sulphate, would render harmless so much of the poison as was still in the stomach unabsorbed.
The first bowl will have the silver cyanide, the second should be treated with ferric and ferroussalt and hydrochloric acid for Prussian blue (vide), the third evaporated and ferric chloride added for the sulphocyanide test.
For still brighter colours, notably yellow and red, stannous chloride was at one time largely employed, now it is used less frequently; and the same may be said of copper and ferrous sulphate, which were used for dark colours.
Wool is mordanted with ferrous sulphate and tartar (3% of each) and dyed in a neutral bath.
Iron Buff is produced by impregnating the cotton with a solution of ferrous sulphate, squeezing, passing into sodium hydrate or carbonate solution, and finally exposing to air, or passing through a dilute solution of bleaching powder.
The ferrous sulphate here employed is oxidized by the chromic acid to a ferric salt, which serves as a carrier of oxygen to the aniline.
Cotton is impregnated with ferrous acetate, dried, aged and fixed with silicate of soda, then dyed in a neutral bath.
Ferric hydrate converts the soluble arsenious acid into the insoluble ferric arseniate, the ferric oxide being reduced to ferrous oxide.
This acid is produced by the distillation of dry ferrous sulphate, at a nearly white heat--either in earthenware or in green glass retorts; the distillate is received in sulphuric acid.
By a suitable movement of the flask, the acid ferrous chloride is allowed to come in contact with the tissue, a gentle heat applied to the flask, and gases are evolved.
These crystals again may be dissolved in a dilute solution of potash, a little ferrous sulphate added, and hydrochloric acid, and in this way Prussian blue produced.
Cadmium may also be estimated volumetrically by digesting the sulphide in a stoppered flask with ferric chloride and hydrochloric acid; the resulting ferrous compound is titrated with permanganate, each c.
Probably the action of ferrous sulphate, like that of the chloride, is profoundly modified by the presence or absence of food in the stomach.
The solution is made up to a known bulk, and portions tested for chlorides by nitrate of silver, and for nitrates by the copper or the ferrous sulphate test.
On treatment with a solution of ferrous chloride, nitric oxide and "soluble" starch are regenerated.
It is based upon the fact that when nitro-cellulose is boiled with ferrous chloride and hydrochloric acid, all the nitrogen is disengaged as nitric oxide (NO).
The lowest increases in employment occurred in the production of fuels, in ferrous metallurgy, and in the manufacture of glass and china.
In the van Ruymbeke process the spent lyes are allowed to settle, and then treated with "persulphate of iron," the exact composition of which is a trade secret, but it is possibly a mixture of ferric and ferrous sulphates.
In this process moistened gold ores are treated with chlorine gas, the resulting gold chloride dissolved out with water, and the gold precipitated with ferrous sulphate, charcoal, sulphuretted hydrogen or otherwise.
Or Gutzkow's method of precipitating the metal with ferroussulphate may be employed.
Or the alloy is dissolved in aqua regia, the solution filtered from the insoluble silver chloride, and the gold precipitated by ferrous chloride.
The specific gravity of gold obtained by precipitation from solution by ferrous sulphate is from 19.
Wool mordanted with 4 per cent of ferrous sulphate and 10 per cent tartar and dyed in a separate bath with weld with 8 per cent chalk, takes a good olive yellow.
A greyish drab may be got by adding ferrous sulphate.
H2O, isomorphous with ferrous sulphate, results on dissolving the metal in dilute sulphuric acid or, better, by dissolving chromous acetate in dilute sulphuric acid, when it separates in blue crystals on cooling the solution.
Add from a weighing bottle a slight excess of the ferrous ammonium sulphate (C), making spot tests on a porcelain plate with the potassium ferricyanide (F).
Calculate the value of the ferrous salt in terms of bichromate.
The methods used in the assay for iron are volumetric, and are all based on the property possessed by certain reagents of oxidizing iron from the ferrous to the ferric state.
So long as the solution contains a ferrous salt, the drop on the tile changes to blue; hence the absence of a blue coloration indicates the complete oxidation of all the ferrous salt and the end of the reaction.
Ammonium ferrous sulphate may also be used; it contains one-seventh of its weight of iron.
The ore is first treated with dilute sulphuric acid, and then ferrous or calcium chloride added, thus forming copper chlorides.
This conversion is effected by allowing the ferrous chloride liquors slowly to descend a tower, filled with pieces of wood, coke or quartz, where it meets an ascending current of chlorine.
Ores in which the copper is present as oxide or carbonate are soluble in sulphuric or hydrochloric acids, ferrous chloride, ferric sulphate, ammoniacal compounds and sodium thiosulphate.
Hot air is blown into the filtrate, which contains ferrous or calcium chlorides, to expel the excess of sulphur dioxide, and the liquid can then be used again.
It may also be accomplished by calcination with ferrous sulphate, or other easily decomposable sulphates, such as aluminium sulphate.
The ferrous chloride formed at the same time is converted into ferric chloride which can be used to moisten the heaps.
The conversion of copper sulphide into the chlorides may be accomplished by calcining with common salt, or by treating the ores with ferrous chloride and hydrochloric acid or with ferric chloride.
Ferrous chloride decomposes the copper oxide and carbonate with the formation of cuprous and cupric chlorides (which remain in solution), and the precipitation of ferrous oxide, carbon dioxide being simultaneously liberated from the carbonate.
Thus Richter found that the refractoriness of clay is influenced by certain oxides in the following order: magnesia, lime, ferrous oxide, soda and potash, but this only applies to clays containing less than 3 per cent.
Alum shales are characterised by a high proportion of pyrites, which, on roasting, formferrous sulphate and sulphuric acid.
The red oxide (ferric oxide) is the most useful form in burned clay, but in the raw material ferrous oxide and ferrous carbonate may also occur, though they are converted into the red oxide on heating.
Iron, in the state of ferric oxide is of less importance, but pyrites and all ferrous compounds are particularly objectionable.
In a reducing atmosphere, on the contrary, ferrous oxide readily forms and attacks the clay, forming a dark grey vitreous mass.
Ferrous and ferric acetates are used as mordants; normal lead acetate is known in commerce as sugar of lead (q.
An almandine in which the ferrous oxide is replaced partly by magnesia is found at Luisenfeld in German East Africa.
The monohydrate also results as a white precipitate when concentrated sulphuric acid is added to a saturated solution of ferrous sulphate.
It is also prepared by precipitating a ferric salt with ammonium sulphide; unless the alkali be in excess a mixture of ferrous sulphide and sulphur is obtained.
Iron dissolves in a solution of sulphur dioxide in the absence of air to form ferrous sulphite and thio-sulphate; the former, being less soluble than the latter, separates out as colourless or greenish crystals on standing.
Heated in air it at first partially oxidizes to ferrous sulphate, and at higher temperatures it yields sulphur dioxide and ferric oxide.
Ferrous salts also give a bluish white precipitate with ferrocyanide, which on exposure turns to a dark blue; ferric salts are characterized by the intense purple coloration with a thiocyanate.
Ferrous oxide is obtained when ferric oxide is reduced in hydrogen at 300 deg.
It may be obtained artificially as a white precipitate, which rapidly turns blue or green on exposure, by mixing solutions of ferrous sulphate and sodium phosphate.
It oxidizes on exposure with considerable evolution of heat; it rapidly absorbs carbon dioxide; and readily dissolves in acids to form ferrous salts, which are usually white when anhydrous, but greenish when hydrated.
Lower down in the bowel these compounds are converted into ferrous sulphide and tannate, and are eliminated with the faeces, turning them black.
The same amateur chemist worked it out that the surface soil of the planet Eire was deficient in iron and ferrous compounds.
Moreover, it appeared that their numbers previously had been held down by the paucity of ferrous compounds in their regular diet.
On this fact depends the process of mordanting wool with potassium bichromate, alum, alumina sulphate, ferrous sulphate, copper sulphate, etc.
When ferrous sulphate (copperas) is used then tartar is almost invariably used as the assistant mordant, oxalic acid only rarely.
By the addition of ferrous sulfate, which undoubtedly functions as an oxygen carrier, the reaction is extended over a longer period of time.
It is thus possible to work with much larger quantities of material when ferrous sulfate is employed.
It is important that the materials should be added in the correct order; should the sulfuric acid be added before the ferrous sulfate, the reaction may start at once.
It is also important to mix the materials well before applying heat; the aniline sulfate should have dissolved almost completely and the ferrous sulfate should be distributed throughout the solution.
Within range, he flung out a weapon new-learned and supposedly irresistible to any ferrous thing or creature, the red converter-field of the Nevians.
The cloud had soon dissolved, and from the place where the planes had been there had floated or crashed down a litter of non-ferrous wreckage.
It wouldn't do any good to make the ship non-ferrous unless you could so change our blood chemistry that we could get along without hemoglobin, and that would be quite a feat," Cleveland agreed.
The Platinotype Process is one in which potassium chloroplatinite and ferric oxalate are converted by light into the ferrous state, and metallic platinum is reduced when in contact with the ferrous oxalate of potash solution.
A bath of equal volumes of saturated solutions of alum and ferrous sulphate gives the negative a deep olive-brown color and an extraordinary intensity, which excludes all possible necessities of an after intensification.
Ferrous oxalate works quite well with plates of that kind; so do soda and potassa developers.
Eder--are from 4 to 6 parts of potassic oxalate to 1 part of ferrous sulphate.
