The Iron Content of a Well Water Sample Must Be

question 7

Short Answer

The iron content of a well water sample must be quantified.A 10.00 mL aliquot of well water is transferred to a 100.0-mL volumetric flask and 20 mL of 0.10 M nitric acid is added to oxidize iron(II)to iron(III).Next 30 mL of a 0.1 M sodium thiocyanate solution is added to form the deep red complex iron(III)thiocyanate.The solution is diluted to volume with distilled deionized water.A reagent blank is similarly prepared.If the absorbance of the iron thiocyanate solution is 0.5483 and the reagent blank absorbance is 0.0282,calculate the iron concentration for the water sample.The molar absorptivity for iron(III)thiocyanate is 3200 M⁻¹ cm⁻¹.Assume a pathlength of 1 cm and a 100% yield.
Fe³⁺ (aq)+ SCN^- (aq)____________________ FeSCN²⁺ (aq)

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