Eriochrome Extra Pure
SHORT DESCRIPTION
Eriochrome Extra Pure—typically referring to Eriochrome Black T—is a complexometric indicator primarily used in EDTA titrations to detect metal ions, especially calcium (Ca²⁺) and magnesium (Mg²⁺) in water hardness analysis. In its extra pure grade, this dye ensures sharp, precise endpoint detection by minimizing impurities that could cause background coloration or interferences in spectrophotometric or volumetric determinations. It functions by forming a wine-red complex with metal ions, which turns blue when the metal is sequestered by EDTA. Suitable for high-precision analytical chemistry, it should be stored away from light and moisture to preserve stability.
Oxalic Acid Extra Pure
SHORT DESCRIPTION
Oxalic Acid Extra Pure is a high-purity, crystalline organic compound known for its strong reducing and chelating properties. Appearing as a white, odorless solid, it is highly soluble in water and widely utilized in both laboratory and industrial settings.
This Extra Pure grade ensures reliable performance in analytical chemistry, metal cleaning, rust removal, and rare earth element processing. In the laboratory, it is commonly used to precipitate calcium ions and to prepare standard solutions for titration. In industries, Oxalic Acid is valued for its effectiveness in bleaching wood, cleaning marble, and removing iron stains from surfaces and textiles. Due to its toxicity and corrosiveness, it must be handled with appropriate personal protective equipment and stored securely in a cool, dry, well-ventilated area.