The following analysis will illustrate the composition of a sample of Cornish wolfram as brought into the market:-- Tungstic acid 50.
The following analysis will illustrate the composition of such a slag:-- Tungstic acid 1.
It must be remembered when calculating the percentage that (with the exception of the silica, tungstic acid, and tin) the determinations have been made on 1 gram of the sample.
For the assay of minerals containing tungsten these reactions are only occasionally taken advantage of for testing or purifying the separated tungstic acid.
Any silica present will be left undissolved; it should be separated and weighed, and its weight deducted from that of the tungstic acid found.
On boiling with hydrochloric acid they are both liberated, and remain for the greater part (all the niobic) in the insoluble residue with the tungstic acid.
The acid filtrate from the silica andtungstic acid is treated with sulphuretted hydrogen.
Tungstic acid may be got into solution after fusion with alkalies or alkaline carbonates.
Tungsten itself is insoluble in nitric acid or aqua regia; but is converted into tungstic acid (WO{3}) by prolonged and strong ignition in air.
The following may be taken as an example of the composition of an impure black tin:-- Tungstic acid 1.
This may be got rid of by boiling in aqua regia, and dissolving out the tungstic acid which has been liberated by means of ammonia.
The resulting tungstic acid is dissolved in ammonia, and the ammonic tungstate purified by crystallisation.
When procured by this method it is unaffected by hydrochloric or diluted sulphuric acid, although it becomes reconverted into tungstic by the action of nitric acid.
Metallic tungsten may also be obtained by the reduction of tungstic acid, by means of charcoal at a white heat.
Tungstic glue has been suggested as a substitute for hard india rubber, as it can be used for all the purposes to which this latter is applied.
A compound of tungstic acid and glue is precipitated, which, at a temperature of 86 deg.
This is an indifferent oxide, and is obtained by treating tungstic acid with hydrogen at a low red heat.
When this ammonic tungstate is heated in the air, it loses ammonia and water, pure tungstic trioxide being left behind.
Chloride of calcium is formed, together with insoluble tungstic acid.
When tungsten occurs in the pulverulent form, it burns easily into tungstic anhydride, when heated in the air; and is oxidised and dissolved when boiled with the caustic alkalies or their carbonates in solution.
If the tungstic acid contain iron, the glass becomes blood-red on cooling, similar to titanic acid.
The molybdic andtungstic acids combine with the soda, forming the respective salts.
If intumescence takes place, the presence of either tartaric acid, molybdic acid, silicic, or tungstic acid, is indicated.
An additional amount of the acid renders it violet, and a still larger quantity affords a beautiful pure blue color, similar to that produced by tungstic acid.
Tungstic acid gives a dark yellow clear bead while hot, but is opaque and yellow when cold.
Silico-tungstic acid is prepared by boiling commercial tungstate of soda with fresh gelatinous silica.
Tungstic acid, an acid of tungsten, H2WO4, analogous to sulphuric and chromic acids.
A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.
By weighing the sample first and extracting the tungsten we get the percentage, when it's been filtered and dried and weighed again, of the tungstic acid in the ore.
Now," he said, when the tungstic acid had been dissolved, and he had dropped a small bar of tin into the solution.
TABLE of the Combinations ofTungstic Acid with the Salifiable Bases.
To procure tungstic acid perfectly pure, the fusion of the ore with carbonat of potash must be made in a crucible of platina, otherwise the earth of the common crucibles will mix with the products, and adulterate the acid.
Scheele, with his usual skill and perseverance, succeeded in proving that it was a compound of lime and a peculiar acid, to which the name of tungstic acid was given.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tungstic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
