Sodium Tungstate Dihydrate

Sodium tungstate dihydrate is a compound with the chemical formula Na2WO4·2H2O. It is a white, crystalline solid that is soluble in water. The compound is commonly used as a precursor for the synthesis of other tungsten compounds and as a reagent in analytical chemistry.

The structure of sodium tungstate dihydrate consists of sodium cations (Na+) and tungstate anions (WO42-) that are held together by ionic bonds. The two water molecules in the formula unit are coordinated with the sodium cations through hydrogen bonding.

The compound has a molar mass of 329.86 g/mol and a density of 3.24 g/cm3. Its melting point is approximately 698 °C and it decomposes at higher temperatures.

In terms of its safety, sodium tungstate dihydrate is considered to be relatively low in toxicity. However, it should still be handled with care, as it can cause skin and eye irritation upon contact. Dust or powder from the compound should not be inhaled, as it may cause respiratory irritation. Proper protective equipment, such as gloves and goggles, should be worn when handling the compound.