Coarse grain size violet tungsten oxide is insoluble in water, so its solubility in water is almost zero. Violet tungsten oxide is also insoluble in ethanol. However, it is soluble in alkali liquor as tungsten oxides are all acidic oxides.
What is solubility?
Solubility refers to the mass of solutes dissolved in a 100g solvent to a saturated state at a certain temperature. The solubility of a substance fundamentally depends on the physical and chemical properties of the solute and solvent as well as on temperature, pressure and the pH of the solution.
Most often, the solvent is a liquid, which can be a pure substance or a mixture. One may also speak of solid solution, but rarely of solution in a gas. By far the most common solvent in chemistry is water which is a solvent for most ionic compounds as well as a wide range of organic substances. This is a crucial factor in acidity/alkalinity and much environmental and geochemical work.
How to determine whether the metal oxide is soluble in water or not?
Except alkali metal elements (sodium, potassium, rubidium, and cesium), other metal oxides are not soluble in water.
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