Гексагидрат хлорида празеодима (III)

Description

Praseodymium(III) chloride hexahydrate is a crystalline hydrate of trivalent praseodymium chloride, PrCl₃·6H₂O. A highly soluble salt of a rare earth element, a working form for introducing praseodymium into aqueous and alcoholic solutions. Directions for use: synthesis of other praseodymium compounds, including anhydrous chloride and oxide; obtaining metal praseodymium by electrolysis of chloride melts; preparation of catalysts by impregnation of the carrier; introducing the element into the glass charge and ceramic glazes; synthesis of coordination compounds and phosphors; analytical practice with solutions of rare earth elements. Commercial varieties reflected in synonymy: praseodymium (III) chloride 99.9% (REO), praseodymium (III) chloride hexahydrate 99.999%, praseodymium (III) chloride hydrate 99.9% (REO).

Basic Attributes

• CAS No: 17272-46-7
• Chemical formula: Cl3H12O6Pr
• Molecular Weight: 355.36
• Exact weight: 225.978
• EU number on the card: 1592732-453-0
• HS code: 28469025
• PSA Specifications: 55.38
• XLogP3: 1.6006

Physico-chemical characteristics

• Density: 2.25 g/ml at 25 °C (literature data)
• Melting point: 769–782 °C

How to read passport numbers

The molecular weight of 355.36 corresponds to PrCl₃ 6H₂O hexahydrate, and the exact mass of 225.978 corresponds to anhydrous PrCl₃ chloride. The same discrepancy is given by the melting point of 769–782 °C: this range refers to anhydrous salt, since the crystalline hydrate first loses water when heated. Direct heating of the hexahydrate does not lead to anhydrous chloride - partial hydrolysis occurs with the formation of oxochloride, so dehydration is carried out in a stream of hydrogen chloride or with chlorinating additives. A practical requirement for containers is tightness: salt is hygroscopic, and the accumulation of moisture shifts the praseodymium content in the sample.

Applications

• starting material for the preparation of anhydrous praseodymium chloride and element oxide
• raw materials for the electrolytic production of praseodymium metal from chloride melts
• impregnating solutions for the manufacture of catalysts
• introduction of praseodymium into glass charge and ceramic glazes
• synthesis of coordination compounds and phosphors
• analytical chemistry of rare earth elements

Hazard classification

• Hazard class code according to the previous system: 36/37/38 - irritating to eyes, respiratory tract and skin
• Safety instructions: 26, 37/39
• Tags: Xi (annoying)
• Water hazard class WGK Germany: 2
• RTECS number: TU0175000

The GHS classification, hazard statements and precautions are not listed on the original product data sheet and are not listed here. They are taken from the safety data sheet for a specific batch.

Storage and handling

Tightly closed container, dry, ventilated room: the hexahydrate is hygroscopic and diffuses when exposed to moist air. The irritating effect on the eyes, skin and respiratory tract is determined by a set of protective equipment - gloves, goggles, overalls, and when pouring and grinding, an additional respirator (instruction 37/39 prescribes the use of gloves and eye or face protection). In case of contact with eyes, immediately rinse with plenty of water and consult a doctor (instruction 26). The second class of WGK obliges to prevent substances and wash water from entering sewers and water bodies.