1. To determine the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3 (B) in an unknown sample, the following representative absorbance data were obtained. A (mol/L) B (mol/L) 510nm 575nm 5×10−1 0 0.714 0.097 0 6×10−2 0.298 0.757 Unknown Unknown 0.671 0.330 Measurements were made in 1.0 cm glass cells. i. Calculate the four molar absorptivities: ∈A(510), ∈A(575), ∈B(510) and ∈B(575). ii. Calculate the molarities of the two salts A and B in the unknown.

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Q: The concentration of Fe²+ in a sample is determined by measuring the absorbance of its complex with…

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Q: A 20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to…

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Q: A solution of FeSCN2+ has an absorbance of 0.237.  What is its concentration?

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Q: Auzure II is a dye with a molar absorptivity (ε657) of 8.13×104 L/mol·cm when measured at 657 nm.…

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Q: 25.0 g of an impure sample containing cobalt was dissolved in acid and diluted to 1000.00 mL. 6.00…

A: The final 250.00 mL sample had absorbance equal to 0.410

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.