Standard absorbance of solution can be expressed by beer lamberts law.
This explains the properties of the material through which light is travelling. Absorbance is directly proportional to the concentration of the solution. Nickel absorbs blue and red photons. The solution of nickel material appears green. Replacing the water molecules in Nicl2 . 6H2O changes the d orbital energy levels. Ligands form a covalent bond with nickel.a non bonded electron pair comes oxygen. It is a relationship between absorbance and concentration of the solution.
A= ecl
where, A=absorbance
e= molar absorption coefficient
c= concentration
l= path length.
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