Erioglucine is a blue­colored dye that absorbs its complementary color, red, in

Question

Erioglucine is a blue­colored dye that absorbs its complementary color, red, in aqueous solution around 645 nm.  Unfortunately, the local distilled water supply is consistently contaminated with a trace amount of a metal cation that also absorbs 645 nm light.  Suppose then, a control sample of 0.0552 M erioglucine (aq same water supply) has an absorbance of 0.331 and that a distilled water sample in a similar cuvette has an absorbance of 0.019.  Determine the concentration of an erioglucine (aq) sample (same water supply) that has an absorbance of 0.237.

Concentration: _____ M

Explanation / Answer

concentration A

0 ->0.019

0.0552M -> 0.331

A = 5.62C+0.019

A-0.019/5.62

C = 0.0389M

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