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.
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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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Q1. 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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