Messrs Versmann and Oppenheim, the introducers of tungstate of soda, give the following formula for a solution of minimum strength:-- Dilute a concentrated solution of neutral tungstate of soda with water to 28 deg.
The addition of a little phosphoric acid or phosphate of soda to the tungstate is recommended, for without this addition a portion of the tungstate is apt to undergo a chemical change and become comparatively insoluble.
When this ammonic tungstateis heated in the air, it loses ammonia and water, pure tungstic trioxide being left behind.
Of the salts of tungsten, tungstate of baryta has been used as a substitute for white lead in painting; but the most important of these is the tungstate of soda, described below.
Wolfram may be regarded as a variable double tungstate of iron and manganese, and the tungsten occurs in this.
It occurs as a brown powder, which absorbs oxygen greedily from the air, and is dissolved by boiling with solution of caustic potash, hydrogen being evolved and potassium tungstate being formed.
Tungsten is also found in the mineral scheelite, a tungstate of lime.
A native tungstate of copper has been discovered in Chili.
It is thus prepared:--Mix together a thick solution of glue with tungstate of soda and hydrochloric acid.
The resulting tungstic acid is dissolved in ammonia, and the ammonic tungstate purified by crystallisation.
The tungstate of ammonia requires simple evaporation on the water-bath and gentle ignition in order to cause the tungstic acid to be left in an almost pure state; possibly, it may carry a little silica.
A solution of tungstate acidulated with hydrochloric acid becomes intensely blue on the addition of stannous chloride and warming.
Ordinary commercial sodiumtungstate is digested with half its weight of phosphoric acid, specific gravity 1.
When a screen coated with these substances is placed near the X-ray tube in a darkened room, the tungstate or barium surface emits a fairly bright fluorescence.
Steep common wicks in a concentrated aqueous solution of Tungstate of Soda, and then dry thoroughly in an oven.
A cheap and useful substitute for Indian rubber is prepared by mixing a thick solution of Glue withTungstate of Soda and Hydrochloric Acid.
Also many lodes contain hard heavy ferric ores, such as titanic iron, tungstate of iron, and hematite, in which gold is held.
This chemical is a salt, made by roasting wolfram with soda ash, and wolfram is a native tungstate of iron and manganese.
As Ham Logan had guessed, the young fire-eater was mixing up a solution of tungstate of soda.
Of course the tungstate of soda that I soaked the clothes in wouldn't keep them from catching fire if I put the suit in a furnace.
It has them, too, to a certain extent, but by experimenting Joe had found the tungstate of soda best.
Do not try to fire-proof the mouth with tungstate of soda.
Commercial sodium tungstateis fused with dried calcium chloride in the proportion of three parts of the former to two parts of the latter, both constituents being in fine powder and well mixed together.
When this state is attained the Roentgen effect as tested by a screen of calcium tungstate should be very brilliant.
The preparation of calcium tungstate for fluorescent screens is very simple.
The announcement is that with this lamp the surgeon may look through the calcium tungstate screen and examine, for example, the fractured bones of the hand, and set them perfectly by actual inspection of the parts with his eye!
The substance which he employed was the tungstate of calcium.
All that is needed in this case is the cathode light, the object to be examined (as for instance the hand), and the screen treated with tungstate of calcium.
Sodium tungstate is digested with half its weight of phosphoric acid, sp.
Silico-tungstic acid is prepared by boiling commercial tungstate of soda with fresh gelatinous silica.
The proportions would be about one pound of the tungstate to a couple of gallons of water.
Wood soaked in a strong solution of tungstate or silicate of soda is rendered uninflammable and nearly incombustible.
For starched goods, the best way to use the tungstate would be to add one part of it to three parts of the starch, and use the compound in the ordinary manner.
This necessary operation of the laundry, however, does not affect tungstate of soda; and all the dresses of a household could be rendered non-inflammable and largely incombustible by dipping them in a solution of this salt.
With us, at least, tungstate of baryta is far from having the body of white lead, and indeed is inferior in opacity to good zinc white.
Tungstate of baryta answers perfectly, covers as well as white lead, and is as unalterable as zinc white.
Unaffected by foul air, the tungstate appears to possess the common fault of all whites when compared with white lead--want of body, moreover it is a bad dryer.
Edison says with regard to this work: "When the X-ray came up, I made the first fluoroscope, using tungstate of calcium.
On the inside of this is spread a layer of tungstate of calcium.
Tungstate of soda has been recommended for the purpose of rendering any article of female dress incombustible.
Any chemist will intimate to the purchaser the manner in which the tungstate of soda should be employed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tungstate" in a variety of sentences. We hope that you will now be able to make sentences using this word.
