Nickel (ll) (N capable forming ent complexes with ethylenediamine (en) in water.

Question

Nickel (ll) (N capable forming ent complexes with ethylenediamine (en) in water. Each of these complexes different color and therefore a different wavelength. Use the data in the table below to construct a Job plot. Assume the pathlength (b) is 1.00 cm. Measured Abs [Ni21] (M) [en] (M) at 545 nm 0.300 000 0.246 At at mole ethylenediamine is the corrected 0.240 0,0600 0.356 absorbance at a maximum 0,210 0.0900 Number 0.180 0,120 0,486 0,150 0,150 0.527 0.135 0,165 0,589 0,180 0,634 What is the corrected absorbance at this mole fraction? 0,120 0.105 0.195 0,657 0.0900 0.608 0.516 0.0750 0.225 0.361 0.240 0.0600 Determine the stoichiometry of the nickel (II)-ethylenediamine 0.0300 0.270 0.158 complex that absorbs at 545 nm. Replace the x and y in the oompound below with the correct numerical values. A value 0.300 of one can be implied and does not need to be included,

Explanation / Answer

the mole fraction of ethylenediamine at the corrected absorbance maximum Xen = 0.65

the corrected absorbance at this mole fraction A = 0.71

the stoichiometry of the nickel(II)-ethylenediamine complex is [Ni (en)2]+2 here X=1 and y= 2

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