Chemistry 325 Instrumental Analysis February 3, 1995 1 Exam 1 ...
Chemistry 325 Instrumental Analysis February 3, 1995 1 Exam 1 ...
Chemistry 325 Instrumental Analysis February 3, 1995 1 Exam 1 ...
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<strong>Chemistry</strong> <strong>325</strong> <strong>Instrumental</strong> <strong>Analysis</strong> <strong>February</strong> 3, <strong>1995</strong><br />
c. What is the function of a monochromator in a spectrometer that employs a tungsten halogen<br />
source?<br />
d. What is the purpose of the chain of dynodes in a photomultiplier tube?<br />
e. In a ultraviolet-visible spectrometer, why is the sample placed after the monochromator?<br />
f. Compute the energy in joules of a photon whose wavelength is 321 nm.<br />
3. (10 points) You are given the following information regarding the precision of four pipets:<br />
volume standard deviation<br />
1 mL 0.006 mL<br />
7 mL 0.02 mL<br />
9 mL 0.02 mL<br />
15 mL 0.03 mL<br />
If you wish to deliver 16 mL, compute the error in each of the two possible delivery methods: (1)<br />
15 mL + 1 mL or (2) 9 mL + 7 mL.
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