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

The tungstic acid is dissolved, and separated as ammonic tungstate, and, after evaporation, is gently ignited, the heat being increased towards the end.

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

For the assay of minerals containing tungsten these reactions are only occasionally taken advantage of for testing or purifying the separated tungstic acid.

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

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.

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

Any silica present will be left undissolved; it should be separated and weighed, and its weight deducted from that of the tungstic acid found.

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

Treat the residue again with acid, and again dissolve out the separated tungstic acid with ammonia, and repeat this operation until decomposition is complete.

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