The hydrolysis of Nickel ion relate to pH was investigated with asic titration based on the change of acidity of solution during hydrolysis. It have been shown that the pH of hydrolysis decreased with bthe increase of Nicked ion Concentration.
The predominating Complex derived from hydrolysis was Ni4(OH)44 + within the pH range of 6~ 7 . the stability constant of Ni 4 (OH)44+ was lgβ= -24.65