(for part a b would be appreciated though sig figs plz) You have been sent to In

Question

(for part a b would be appreciated though sig figs plz)

You have been sent to India to investigate the occurrence of goiter disease attributed to iodine deficiency. As part of your investigation, you must make field measurements of traces of iodine (I -) in groundwater. The procedure is to oxidize (I -) to I2 and convert the I2 into an intensely colored complex with the dye brilliant green in the organic solvent toluene.

(a) A 3.05 ? 10-6M solution of the colored complex exhibited an absorbance of 0.291 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. Find the molar absorptivity of the colored complex.

You have been sent to occurrence of goiter disease attributed to iodine defi ly colored th the dye bri ib The absorban:e of an unknown solution prepared from groundwater was o.101. Find the concentration of the unknown. of 0.019. Hnd th ptivity of the

Explanation / Answer

a)Use the Beer-Lambert's law to solve this problem,
A = lc
= ? = molar absorptivity
0.291 =    * 1 cm * 3.05*10-6 M
= molar absorptivity = 95409.836 M-1 cm-1   
b) The absorbance of the unknown solution from groundwater , A = 0.161
   0.161 =  95409.836 M-1 cm-1 * 1 cm * C
   C = 1.68745 * 10-6 M

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