Calcium oxalate extra pure
Description
Calcium oxalate extra pure is a high-purity grade of CaC₂O₄ (often as monohydrate CaC₂O₄·H₂O), supplied as a fine white crystalline powder with minimal impurities (<0.1% heavy metals, sulfates, chlorides) for precise analytical and laboratory applications.
Properties
It forms odorless, tasteless crystals (monoclinic or tetragonal depending on hydration), insoluble in water (Ksp ~2.3×10⁻⁹), dilute acids, or alcohol, but soluble in strong acids with CO₂ evolution; density ~2.2 g/cm³, decomposes at ~450°C.
Production
Precipitated by mixing calcium chloride or nitrate with oxalic acid or ammonium oxalate solutions under controlled pH and temperature, then filtered, washed, dried, and assayed for purity meeting AR/ACS standards.
Main uses
Extra pure grade serves as a primary standard for calcium titration, analytical reagent in gravimetric analysis, reference material for kidney stone studies, and in ceramics/glass flux or rare earth separation; avoided in food due to low bioavailability.
Specifications
| Model No. | N-CH1522 |
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