You have been sent to India to investigate the occurrence ofgoiter disease attributed to iodine deficiency. As part of your investigation, you must make field measurements of traces of iodide ${\mathbf{I}}_{\mathbf{2}}$in groundwater. The procedure is to ${\mathbf{I}}_{\mathbf{2}}$ into an intensely colored complex with the dye brilliant green inthe organic solvent toluene.

(a)A $\mathbf{3}\mathbf{.}\mathbf{15}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{6}}\mathbf{M}$solution of the colored complex exhibited an absorbance of 0.267 at 635nmin a 1.00 - 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 coloredcomplex.

(b) The absorbance of an unknown solution prepared from groundwater was0.175. Find the concentration of the unknown.

Step by step solution

01

Define Iodine Deficiency

Iodine deficiency is a lack of the trace element iodine, an essential nutrient in thediet.

02

Calculation of Concentration

A = 0.175 - 0.019 = 0.156

Concentration of unknown

$$\begin{gathered} \mathrm{c}=\frac{\mathrm{A}}{\mathrm{b}.\dot{\mathrm{o}}}=\frac{0.156}{78730{\mathrm{M}}^{-1}{\mathrm{c}}^{-1}.1\mathrm{cm}} \\ \mathrm{c}=1.98.{10}^{-6}\mathrm{M} \end{gathered}$$

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