LaCl37H2O

LaCl37H2O, more commonly known as lanthanum(III) chloride heptahydrate, is a hydrated salt of lanthanum. The chemical formula indicates that for each formula unit of lanthanum chloride (LaCl3), there are seven molecules of water of crystallization. This compound typically appears as white crystalline solid. It is soluble in water and also in ethanol.

Lanthanum(III) chloride heptahydrate is hygroscopic, meaning it readily absorbs moisture from the surrounding atmosphere, which can lead to its deliquescence. Due to its hydrated nature, it is important to store it in tightly sealed containers to prevent degradation. When heated, it will first lose its water of hydration before potentially decomposing.

This compound is primarily used as a source of lanthanum in various chemical applications. It can be employed in the synthesis of other lanthanum compounds, catalysts, and specialized glass. In research settings, it serves as a starting material for experiments involving lanthanum chemistry. Its preparation typically involves dissolving lanthanum oxide or lanthanum carbonate in hydrochloric acid and then crystallizing the hydrated salt from the solution.