The nitrite ion (NO2-) is commonly determined by a colormetric procedure using a

Question

The nitrite ion (NO2-) is commonly determined by a colormetric procedure using a reaction called the Griess reaction. Im this reaction the sample containing nitrate is reacted with sulfanilimide and N-(1-napthyl)ethylenediamide to form a colored species that absorbs at 550 nm, By using an automated flow aalysis instrument, the followig results were obtained for standard solutions of nitrate and for a sampke containing an unknown amount of nitrite.


Solution Absorbance at 550 nm

Blank 0.002

2.00 ?M 0.065

6.00 ?M 0.205

10.00 ?M 0.388

14.00 ?M 0.474

18.00 ?M 0.598

Unknown 0.402  

*****Provide the value for the molar absorptivity using the correct units (M-1cm-1) !!!

I found the unknown M to be 11.97uM. Please show your work. Points will be awarded :)

Explanation / Answer

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