Lanthanum Chloride Heptahydrate is a highly water-soluble, crystalline inorganic rare-earth salt primarily used as a mild Lewis acid catalyst in organic synthesis, a phosphate precipitant in analytical chemistry, and a biochemical tool for calcium channel studies. Because it contains seven bound water molecules in its crystal lattice, it serves as a highly stable, manageable source of trivalent lanthanum (La3+) ions for laboratory applications.Lanthanum Chloride Heptahydrate AR (Analytical Reagent) grade is an ultra-pure, crystalline rare-earth salt specifically refined for high-precision laboratory analysis, analytical chemistry, and sensitive biochemical research. The “AR” or “AR/ACS” designation guarantees a minimum assay purity of (98.5% to 99.0%), ensuring that trace heavy metals, iron, and other rare-earth impurities are kept below strict laboratory tolerances.