The vapour tension of this crystallo-hydrate equals the atmospheric at 165°, and therefore the crystals may be dried in an atmosphere of steam and obtained without a mother liquor, whose vapour tension is greater.
If the acid does not act on the given insoluble hydrate (at any temperature), then it has not a basic character, and it should be tested as to whether it has an acid character.
It must not be imagined that water really exists in hydrateof lime, any more than that ice or steam exists in water.
It is rapidly acted on by water, especially if means are taken to remove the layer of calcium hydrate formed on the metal; alcohol acts very slowly.
The method here given partakes of the usual imperfections, that the fatty acids as well as the unsaponified soap are equally estimated, and the mixed hydrateor carbonate of the alkali as well as the combined alkali.
It is generally now termed the hydrate of the oxide of amyl, from amyl being supposed to be its base or radical, as cyanogen is regarded to be the radical of another series of compounds.
The hydrate of chloral is a more powerful agent, and if the eclampsia be not quickly controlled, I commonly employ it per rectum, dissolved in one or two teaspoonfuls of water.
It should be given in moderate doses, and preferably combined with chloroform or ammonia, or, if more expedient to administer per rectum, combined with solutions of chloral hydrate or bromide of potassium.
The eclampsia continued one hour, and were controlled by large and repeated doses of bromide of potassium, aided by clysters of five grains of hydrate of chloral in water.
Chloral hydratemay be administered by enema, or morphia hypodermically.
Bromide of potassium and hydrate of chloral have also been employed to allay the spasmodic symptoms; but the former is too feeble for the purpose, and the depressing action of the latter upon the heart renders it dangerous.
When insomnia exists, chloral hydrate or bromide of potassium may be conveniently given in these vehicles.
To such as react acid, add very cautiously n/1 sodium hydrate solution to the medium in bulk until the neutral tint has returned).
Control the result and estimate the amount of sodic hydrate necessary to be added to render the remainder of the solution neutral to litmus.
When distilled with potassium hydrate it yields quinoline, lutidine, and two isomeric collidines.
The object of adding this acid is to dissolve the hydrate of oxide of zinc formed during the electrolysis and deposited in a whitish stratum upon the surface of the copper.
The principal impurities of crude vat-liquor are sodium hydrate and sulphide, the latter of which always leads to the formation of soluble double sulphur salts of sodium and iron.
When this takes place in an aqueous solution, the alkaline metal at once reacts with the water, so that a solution of an alkaline hydrate is formed while hydrogen escapes.
By drying at ordinary temperatures, the hydrate Al(OH)3.
Villard that when allowed to stand in the presence of water at a low temperature a solidhydrate is formed.
The chemical reaction is altered, oxide or hydrate is formed, which will partially dissolve, to be changed to sulphate when the sulphuric acid subsequently diffuses in.
After from half an hour to a whole hour the conversion of sodium carbonate into sodium hydrate is brought about as far as is practicable.
The first action of the lime is to convert the manganese chloride into manganous hydrate (Mn(OH)2) and calcium chloride; then more lime is added which greatly promotes and hastens the oxidizing process.
If, however, the action of the chlorine on the sodium hydrate is prevented, which can be done in various ways, they can both be collected in the isolated state and utilized as has been previously described, viz.
Until recently, the high cost of barium hydrate has rendered its use prohibitive but at the present it is obtained as a by-product in cement manufacture and it may be purchased at a more reasonable figure than heretofore.
Carbonate of soda and hydrate of soda (caustic soda) are used either alone or together as the reagents.
The ferric hydratewas dissolved in dilute acid, and reprecipitated, dried, ignited, and weighed.
The alumina is contained in the filtrate, which is acidified with hydrochloric acid and the alumina precipitated therefrom as hydrate with ammonia, as just described.
But it is best prepared by adding strong sulphuric acid to ferric hydrate in equivalent proportions.
Ammonia or sodic hydrate (free from carbonates) give yellow precipitates, which are insoluble in excess of the reagent, but are soluble in acids.
The solution, which contains the nickel free from other metals, is heated, and a solution of sodic hydrateadded in slight excess.
Filter off the precipitated ferric hydrate through a quick filter, and wash with hot water.
The solution of this substance is known as ammonic hydrate or "ammonia.
The hydrate is washed with hot water, dried, ignited, and weighed as beryllia, BeO.
The price paid for ease of handling is too great when purchase of the hydrate is made under such circumstances.
Most manufacturers of the hydrate locate their costly plants where the limestone is relatively pure.
The prevailing practice, however, of marketing the hydrate at a much higher price per ton than the stone-lime should prevent sales to farmers.
While the hydrate contains less strength than the stone-lime, it is in good physical condition for distribution, and the stone-lime must be slaked.
The possibility of the activity of the plants being due to its normal acidity was excluded by neutralizing the extract with sodium hydrate and precipitating the salts with alcohol.
The reactions with sodium hydrate and sodium carbonate, are not so clear or decisive.
With alkalies it turns brown, giving ferric hydrate and an alkaline ferrocyanide.
I examined the evacuation, and came to the conclusion that it was such as would pass from a person who had taken arsenic, and I immediately advised that the antidote for arsenic, hydrate of magnesia, should be administered.
Ammonia hydrate produces a precipitate in a much finer state of divison, which does not dissolve in excess when examined in a test-tube, it somewhat resembles thin starch paste.
Upon the addition of either caustic soda or potash, a white gelatinous precipitate is formed (hydrate of alumina), which is soluble in excess of the reagent employed.
The hydrate of the protoxide of tin can be ignited by the flame of a candle, and glows like tinder.
The hydrate of baryta melts by a low red heat without losing its water of hydration.
Protoxide of Manganese exists as a green powder; as hydrate separated by caustic alkalies, it is white, but oxidizes very speedily upon exposure to the air.
Magnesia and its hydrate are white and very voluminous, scarcely soluble in hot or cold water, and restores moistened red litmus paper to its original blue color.
The hydrate of strontia has the same properties as the hydrate of baryta, except that it is less soluble in water.
The liquid must be filtered while hot, and as it cools thehydrate of baryta appears in crystals.
When exposed to heat, the hydrate loses its water, and gives a peculiarly beautiful flame.
With still more water it forms a crystalline mass, the hydrate of baryta, which is completely soluble in hot water.
The hydrate of lime is far less soluble in water than either those of baryta or strontia, and is less soluble in hot water than in cold.
Its hydrate is white, and is insoluble in water and nitric acid.
Mix one part of the substance with about four parts of the hydrate of baryta, and expose it to the blowpipe flame.
One of the causes of this alteration in the proportion of the metals may lie in the fact that basic carbonate of copper is soluble in water containing free carbonic acid, whilst tin hydrate is insoluble.