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Do you know the characteristics and structure of nickel chloride

  Nickel chlorideAlso known as 2-nickel chloride, it is a chemical substance with the chemical formula of NiCl2. Anhydrous 2-nickel chloride is yellow, but it is very rare in nature, and can only be found in ores such as hydronickelite. What is more familiar to people is the green 2-nickel chloride 6 hydrate (NiCl2 6H2O). 2-nickel chloride also has a series of known hydrates, all of which are green. Generally speaking, 2-nickel chloride is chemically synthesized It is an important and important source of nickel in China. Nickel salts are carcinogenic.

Physicochemical properties Green or grass green monoclinic prismatic crystal. Relative density 1.921 g\/cm3. Bulk density: about 1.00 g\/cm3 (uncompacted). Melting point 80 degrees Celsius. Dehydration at 103oC. Decomposition at 973oC. Solubility: 2135 g\/L (20oC); 5878 g\/L (80oC). 5% aqueous solution pH=3.5. Larger insoluble content: 50 parts per million (nickel (Ni) percent larger mass: 24.00; cobalt (Co) ) Percentage of larger mass: 0.5; Copper (Cu): 2 ppm; Heavy Metal (Pb): 2 ppm; Iron (Zn): 1 ppm). Tariff rate of nickel chloride: 28.27 It is easily soluble in water and ethanol, and its aqueous solution is slightly acidic. It is easily weathered in dry air and deliquescent in humid air. When heated to above 140 degrees Celsius, it will fully lose crystal water and become yellow-brown powder.

Characteristics and structure of nickel chloride: NiCl2 adopts a CdCl2 type structure. In this structure, each Ni2 is coordinated with 6 Cl−, and each Cl− is coordinated with 3 Ni2. In NiCl2, The Ni-Cl bond has the characteristics of an ionic bond. The yellow NiBr2 and the black NiI2 also adopt a similar structure, but due to the different filling methods of the halogen atoms, these two nickel halides adopt a CdI2 type structure.

In contrast, NiCl2·6H2O has trans-NiCl2(H2O)4 units and water molecules. NiCl2(H2O)4 is connected with the adjacent water molecules by weak force. It should be noted that the 6 in the molecular formula Of the water molecules, only 4 are complexed with nickel, while the other 2 remaining water molecules become crystal water. Cobalt(II) chloride 6 hydrate also has a similar structure.

Many nickel(II) chemistries are paramagnetic and therefore have 2 unpaired electrons on each metal atom; however, when nickel forms a 4-coordination complex ion with a planar square configuration, this The complex is diamagnetic.