pH Metric Studies on the Non-biuret Complex of Copper Succinimide

Formation of non-biuret complex of succinimide with copper sulphate has been realised below pH 8. pH-metric titrations show that H⁺ ions are released and the anionic form of succinimide takes part in the forma­tion of 1:2 copper succinimide complex. The stepwise and overall stability constants of the complex, calculated by Bjerrum's method, are log K₁= 3.5, log K₂ 4.7, and log K = 8.2, where K₁, K₂ and K are stability constants for I step, II step, and. overall reactions respectively.