New PDF release: Analytical Chemistry

By Gary D. Christian

ISBN-10: 0470887575

ISBN-13: 9780470887578

The seventh version of Gary Christian's Analytical Chemistry makes a speciality of extra in-depth assurance and data approximately Quantitative research (aka Analytical Chemistry) and similar fields. The content material builds upon past variations with extra more suitable content material that bargains with ideas and strategies of quantitative research with extra examples of analytical options drawn from parts akin to medical chemistry, existence sciences, air and water toxins, and commercial analyses.

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Extra resources for Analytical Chemistry

Sample text

M. Page 12 CHAPTER 1 ANALYTICAL OBJECTIVES, OR: WHAT ANALYTICAL CHEMISTS DO PERFORMING THE MEASUREMENT——YOU DECIDE THE METHOD Instruments are more selective and sensitive than volumetric and gravimetric methods. But they may be less precise. The method employed for the actual quantitative measurement of the analyte will depend on a number of factors, not the least important being the amount of analyte present and the accuracy and precision required. Many available techniques possess varying degrees of selectivity, sensitivity, accuracy and precision, cost, and rapidity.

Fig. 1. Steps in an analysis. can do is present the analytical data (and give an indication of its range of accuracy). The client must decide whether it is safe to drink, perhaps relying on other experts. Also, never report an answer as “zero,” but as less than the detection limit, which is based on the measurement device/instrument. We are limited by our methodology and equipment, and that is all that can be reported. Some modern instruments, though, can measure extremely small amounts or concentrations, for example, parts per trillion.

1 to accomplish the following analyses: (a) the purity of NaCl in table salt, (b) the acetic acid content of vinegar, (c) the pH of swimming pool water. Logical Thinking The role of thinking logically is paramount in analytical chemistry. Here is a logical brain teaser, a favorite of Professor Richard N. Zare, Stanford University: If a solution of salt (NaCl) is electrolyzed, at the negative electrode, hydrogen is generated and at the positive electrode, chlorine is generated: Na+ + e− + H2 O = NaOH + 1/2 H2 Cl− − e− = 1/2 Cl2 An electrolysis cell has been set up in a small closed room and outside there are three switches—only one turns the cell on, the others are dummies.

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Analytical Chemistry by Gary D. Christian

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