At a pH of 4, the Cu-neocuproine complex formed in the liquid-liquid extraction experiment has a...

At a pH of 4, the Cu-neocuproine complex formed in the liquid-liquid extraction experiment has a partition coefficient of about 6.3 when equilibrated between the acid aqueous solution and chloroform. Calculate the concentration of Cu in the chloroform phase if 40.0 mL of a 0.26 M aqueous Cu solution buffered to pH 4 is equilibrated with 16.0 mL of chloroform.

Expert Solution

Molecular mass of Copper neocuproine complex = 480 amu.

Mass of cuproin complex present in 40 ml of 0.26M aqueous layer at distribution = 40 x 0.26 x 480 mg = 4.992 g

Given that, K_D = Conc. Of complex in aqueous /Conc. Of complex in CHCl₃ = 6.3

6.3 = 0.26/ x

Conc. Of copper in CHCl₃ = 0.04126 M

queen_honey_blossom answered 2 years ago

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