1. Preparation

2. Uses

3. References

Tungstic acid refers to hydrated forms of tungsten trioxide, WO₃. The simplest form, the monohydrate, is WO₃·H₂O, H₂WO₄. The dihydrate WO₃·2H₂O is also known. The solid-state structure of WO₃·H₂O consists of layers of octahedrally coordinated WO₅(H₂O) units where 4 vertices are shared.^[1] The dihydrate has the same layer structure with the extra H₂O molecule intercalated between the layers.^[1] The monohydrate is a yellow solid and insoluble in water. The classical name for this acid is 'acid of wolfram'. Salts of tungstic acid are tungstates.

The acid was discovered by Carl Wilhelm Scheele in 1781.^[2]

Preparation

Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates. It may also be prepared from the reaction between hydrogen carbonate and sodium tungstate. It can also be obtained from pure tungsten by reaction with hydrogen peroxide.^[3]

Uses

It is used as a mordant and a dye in textiles.

References

• The Twelve (Latter Day Saints)
• The Twelve Little Cakes
• The Twelve Months
• The Twelve Months (1956 film)
• The Twelve Months (fairy tale)
• The Twelve Peers
• The Twelve Powers of Man
• The twelve pyramids
• The Twelve Tasks of Flavia Gemina
• The Twelve Tribes
• The Twelve Tribes of Israel
• The Twelve Wild Ducks
• The Twelve (X-Men)
• The Twenties
• The Twenty-Four Parganas
• The Twenty, Georgia
• The twenty-ninth day of the eighth month of the gregorian calendar
• The Twenty One Balloons
• The Twenty-Second Day
• The Twenty-Seven Points
• The twenty seventh amendment
• The Twenty-Seventh City
• The twenty-tens
• The Twenty Treasures
• The Twenty Treasures of Zork