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(a) A 3.96 104 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a
Chapter 17, Problem 17-B(choose chapter or problem)
(a) A 3.96 104 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvet; a blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A. (b) The absorbance of an unknown solution of compound A in the same solvent and cuvet was 0.375 at 238 nm. Find the concentration of A in the unknown. (c) A concentrated solution of compound A in the same solvent was diluted from an initial volume of 2.00 mL to a final volume of 25.00 mL and then had an absorbance of 0.733. What is the concentration of A in the concentrated solution?
Questions & Answers
QUESTION:
(a) A 3.96 104 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvet; a blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A. (b) The absorbance of an unknown solution of compound A in the same solvent and cuvet was 0.375 at 238 nm. Find the concentration of A in the unknown. (c) A concentrated solution of compound A in the same solvent was diluted from an initial volume of 2.00 mL to a final volume of 25.00 mL and then had an absorbance of 0.733. What is the concentration of A in the concentrated solution?
ANSWER:Step 1 of 5
(a)
The absorbance of the solution of A = 0.624
The absorbance of the blank solution = 0.029
Hence, the absorbance due to A = (0.624-0.029)=0.595
The concentration of the solution (c) = 
Path length (l) = 1.000cm