Search results
Results from the WOW.Com Content Network
Sodium tungstate is obtained by digestion of tungsten ores, the economically important representatives of which are tungstates, in base. Illustrative is the extraction of sodium tungstate from wolframite: [1] Fe/MnWO 4 + 2 NaOH + 2 H 2 O → Na 2 WO 4 ·2H 2 O + Fe/Mn(OH) 2. Scheelite is treated similarly using sodium carbonate.
Ammonium paratungstate (or APT) is a white crystalline salt with the chemical formula (NH 4) 10 (H 2 W 12 O 42)·4H 2 O. It is described as "the most important raw material for all other tungsten products." [2]
This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
This salt has been used in the manufacture of dense aqueous solutions. Sodium metatungstate exists as white solid. Sodium metatungstate exists as white solid. The anion is the polyoxotungstate [H 2 W 12 O 40 ] 6- , which features six-coordinated tungsten(VI) centers interconnected with doubly- and triply bridging oxo ligands.
Tungsten (also called wolfram) [14] [15] is a chemical element; it has symbol W and atomic number 74. It is a rare metal found naturally on Earth almost exclusively ...
Thermal conductivities have been measured with longitudinal heat flow methods where the experimental arrangement is so designed to accommodate heat flow in only the axial direction, temperatures are constant, and radial heat loss is prevented or minimized.
What Is A Celery Rib? A celery rib is one of the individual stems that make up the larger bunch of celery, or "stalk." In botanical terms, a rib is a single segment of the plant, and in culinary ...
Tungsten hexachloride is an inorganic chemical compound of tungsten and chlorine with the chemical formula W Cl 6. This dark violet-blue compound exists as volatile crystals under standard conditions. It is an important starting reagent in the preparation of tungsten compounds. [1]