Chapter 13: Q. 13.16 (page 329)
Why does a deuterium lamp produce a continuum rather than a line spectrum in the UV?
The continuum spectrum is the result of continually fluctuating energy in the ultraviolet area.
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A aliquot of a solution that contains ppm iron(III) is treated with an appropriate excess of to form the complex and diluted to . What is the absorbance of the resulting solution at nm in a cell? See Problem for absorptivity data.
At 580 nm, which is the wavelength of its maximum absorption, the complex has a molar absorptivity of 7.00 * 103 L cm -1 mol -1. Calculate
(a) the absorbance of a 4.47 * 10 -5M solution of the complex at 580 nm in a 1.00-cm cell.
(b) the absorbance of a solution in a 2.50-cm cell in which the concentration of the complex is one half that
in (a).
(c) the percent transmittance of the solutions described in (a) and (b).
(d) the absorbance of a solution that has half the transmittance of that described in (a).
The absorbances of solutions containing Cr as dichromate in were measured at nm in a 1.0-cm cell.
Find the absorptivity of dichromateand the molar absorptivity at nm.
The following results were obtained:
A solution containing had a transmittance of in a cell at . Calculate the molar absorptivity of at.
Define
(a) dark current.
(b) transducer.
(c) scattered radiation (in a monochromator).
(d) source flicker noise.
(e) cell positioning uncertainty.
(f) beamsplitter.
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