Nickel hydroxide 
 Structural Formula: Ni (OH) 2 type of measurement: H2Ni1O2 Molecular weight: 92.7138 Melting Point: 230 ° C Density: 4150 kg/m3 (° C) form (room temperature): Crystal or no color (room temperature): 
 Blue-green Solubility (water): 7.413-related traits: the reduction of nickel hydroxide hydroxide, and some strong oxidant can react NiO (OH), strong alkaline, as in alkali, in the saturated aqueous solution ( quality than the concentration of 5%) 
 Can be ionized in a large number of OH-and a small amount of [Ni (OH) 6] 4 - anions, can be dissolved NaOH, KOH and other alkaline form Na4 [Ni (OH) 6] or K4 [Ni (OH) 6], evaporated and so easy to get Na4NiO3 salt hydrolysis.