Auv-vis experiment was conducted at 592 nm for an aqueous solution of copper analyte in the presence of nickel interferent. the selectivity coefficient ka, i = 15.5. in one experiment, [cu2+] = 60.0 mm and [ni2+] = 15.0 mm. the average absorbance was measured as 0.465 au with an average blank signal of 0.0105 au. what is the absorbance, in au, due to cu2+ only?
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