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 iodide (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 3.15 106 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. find the molar absorptivity of the colored complex.
(b) the absorbance of an unknown solution prepared from groundwater was 0.175. find the concentration of the unknown.