Questions from General Chemistry

Q: Calculate the absorbances of solutions with half the transmittance of those in

Calculate the absorbances of solutions with half the transmittance of those in Problem 22-15. Absorbances of solutions in Problem 22-15: a) A = 0.565 b) A = 0.237 c) A = 0.514 d) A = 0.816 e) A =...

Q: Evaluate the missing quantities in the accompanying table. Where needed,

Evaluate the missing quantities in the accompanying table. Where needed, use 200 for the molar mass of the analyte.

Q: A solution containing 5.61 ppm KMnO4 exhibits 55.3

A solution containing 5.61 ppm KMnO4 exhibits 55.3 %T in a 1.00-cm cell at 520 nm. Calculate the molar absorptivity of KMnO4 at this wavelength.

Q: Beryllium (II) forms a complex with acetylacetone (166.

Beryllium (II) forms a complex with acetylacetone (166.2 g/mol). Calculate the molar absorptivity of the complex, given that a 2.25-ppm solution has a transmittance of 37.5% when measured in a 1.00-cm...

Q: At 580 nm, the wavelength of its maximum absorption, the

At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 X 103 L cm-1 mol-1. Calculate (a) The absorbance of a 3.40 X 10-5 M solution of the complex...

Q: A 2.50-mL aliquot of a solution that contains

A 2.50-mL aliquot of a solution that contains 4.33 ppm iron (III) is treated with an appropriate excess of KSCN and diluted to 50.0 mL. What is the absorbance of the resulting solution at 580 nm in a...

Q: A solution containing the complex formed between Bi(III) and

A solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of 9.32 x 103 L cm-1 mol-1 at 470 nm. (a) What is the absorbance of a 5.67 x 10-5M solution of the compl...

Q: The complex formed between Cu(I) and 1, 10

The complex formed between Cu(I) and 1, 10-phenanthroline has a molar absorptivity of 6850 L cm-1 mol-1 at 435 nm, the wavelength of maximum absorption. Calculate (a) The absorbance of a 4.42 x 10-5...

Q: A solution with a “true” absorbance [A = -

A solution with a “true” absorbance [A = -log(P0/P)] of 2.10 was placed in a spectrophotometer with a stray light percentage (Ps/P0) of 0.75. What absorbance A’ would be measured? What percentage erro...

Q: A compound X is to be determined by UV/visible spectrophotometry

A compound X is to be determined by UV/visible spectrophotometry. A calibration curve is constructed from standard solutions of X with the following results: 0.50 ppm, A = 0.24; 1.5 ppm, A = 0.36; 2.5...