tungstic acid

American  

noun

Chemistry.

1. a hydrate of tungsten trioxide, H 2 WO 4 ⋅H 2 O, used in the manufacture of tungsten-lamp filaments.

2. any of a group of acids derived from tungsten by the addition of acid to a soluble tungstate or to a mixture of a tungstate and a silicate, phosphate, etc.

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tungstic acid British  

noun

1. any of various oxyacids of tungsten obtained by neutralizing alkaline solutions of tungstates. They are often polymeric substances, typical examples being H 2 WO 4 ( orthotungstic acid ), H 2 W 4 O 13 ( metatungstic acid ), and H 10 W 12 O 14 ( paratungstic acid )

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Etymology

Origin of tungstic acid

First recorded in 1790–1800

Example Sentences

See Examples For:

tungstic acid

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.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous

“Now,” he said, when the tungstic acid had been dissolved, and he had dropped a small bar of tin into the solution.

From Shadow Mountain by Dane Coolidge

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.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Cornelius Beringer

This solution gives with hydrochloric acid a white precipitate of tungstic acid, which becomes yellow on boiling, but the separation is not complete.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Cornelius Beringer

The residual tungstic acid is fixed, so that when the ammonia has been driven off it may be strongly heated without loss.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Cornelius Beringer