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

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

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 Beringer, Cornelius

It consists of silica with the tungstic acid.

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

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.

From Shadow Mountain by Coolidge, Dane