Problem: A 3.15 x 10-6 M solution of the colored complex exhibited an absorbance of 0.267 at 635 nm in a 1.000 cm cuvet. A blank solution made from distilled water in place of groundwater had an absorbance of 0.019. The absorbance of an unknown solution prepared from ground water was 0.175. Find the concentration of the unknown. 

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A 3.15 x 10-6 M solution of the colored complex exhibited an absorbance of 0.267 at 635 nm in a 1.000 cm cuvet. A blank solution made from distilled water in place of groundwater had an absorbance of 0.019. The absorbance of an unknown solution prepared from ground water was 0.175. Find the concentration of the unknown. 

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