C201-exam - Chem 201Quantitative Analysis Exam#2 16 November 2010 Name 1(10 points For the following characteristics of optical spectroscopy

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Chem 201—Quantitative Analysis Exam #2 16 November 2010 Name ________________________ 1. (10 points) For the following characteristics of optical spectroscopy, determine if it applies to absorption spectroscopy or luminescence spectroscopy: small signal on small background small signal on large background requires use of two monochromators limited applicability to species that emit light requires use of one monochromator can be used to detect any atom or molecule 2. (5 points) What effect does flame temperature have on signal value for atomic absorption spectrometry? Explain your answer. 3. (10 points) A buffer solution is made b y dissolving 2.858 g benzoic acid (C 6 H 5 COOH) and 2.763 g sodium benzoate (NaC 6 H 5 COO) in 100.0 mL water. 10.0 mL of 0.154 M NaOH is added to the solution. Determine the pH of the final solution. C 6 H 5 COOH(aq) + H 2 O C 6 H 5 COO - (aq) + H 3 O + (aq) K a = 6.28 x 10 -5
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4. (25 points) The amount of lead in an aqueous sample is determined by atomic absorption
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C201-exam - Chem 201Quantitative Analysis Exam#2 16 November 2010 Name 1(10 points For the following characteristics of optical spectroscopy

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