Nickel chloride 
 Formula NiCl2-6H2O CAS No. 7791-20-0 
 Physico-chemical properties of green or grass green monoclinic prismatic crystals. The relative density of 1.921 g / cc. Bulk density: about 1.00 grams / cubic centimeter (not compacted). Melting point of 80 ℃. Dehydration at 103oC. Decomposition at 973 oC. Solubility: 2135 g / l (20oC); 5878 g / l (80oC). 5% aqueous solution of pH = 3.5. Maximum insoluble matter: fifty millionths (nickel (Ni)% maximum mass: 24.00; cobalt (Co)% maximum quality: 0.5; copper (Cu): ppm; heavy metals (Pb): ppm ; iron (Zn): parts per million). Nickel chloride tariff rate: 28.27 soluble in water, ethanol, its aqueous solution was slightly acidic. In dry air easily weathered, easy to deliquesce in moist air. Heated to above 140 ℃ complete loss of crystal water was yellow-brown powder. Molecular weight of 237.69. Consumption of fixed laws nickel nickel nickel-metal wastes Law (Ni 97%) 0.270 sodium carbonate (Na2CO3 98%) 0.700 hydrochloric acid (HCl 31%) 1.100 3.000 Nickel-containing waste (in Ni 100% total) 0.270 nitric acid (HNO3 97%) 0.277 Application for electroplating, but also as a preservative and ammonia absorbent