Modern Analytical Chemistry by David T. Harvey
By David T. Harvey
Smooth Analytical Chemistry is a one-semester introductory textual content that meets the wishes of all teachers. With assurance in either conventional issues and modern day subject matters, teachers could have the flexibilty to customise their direction into what they think is critical for his or her scholars to realize the options of analytical chemistry.
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Example text
For a pipet this means that the delivered volume is less than the calibrated volume, whereas drops of liquid above the calibration mark mean that a volumetric flask contains more than its calibrated volume. Commercially available cleaning solutions can be used to clean pipets and volumetric flasks. 1400-CH02 9/8/99 3:48 PM Page 29 Chapter 2 Basic Tools of Analytical Chemistry Second, when filling a pipet or volumetric flask, set the liquid’s level exactly at the calibration mark. 6). The meniscus should be adjusted with the calibration mark at eye level to avoid parallax errors.
2 Membrane filter showing colonies of coliform bacteria. The number of colonies are counted and reported as colonies/100 mL of sample. Chart showing hierarchical relationship among a technique, methods using that technique, and procedures and protocols for one method. (Abbreviations: APHA = American Public Health Association, ASTM = American Society for Testing Materials, EPA = Environmental Protection Agency) PourRite™ is a trademark of Hach Company/photo courtesy of Hach Company. Finally, a protocol is a set of stringent written guidelines detailing the procedure that must be followed if the agency specifying the protocol is to accept the results of the analysis.
You should be familiar with the proper use of this equipment. You also should be familiar with how to prepare a stock solution of known concentration, and how to prepare a dilute solution from a stock solution. 2I PROBLEMS 1. Indicate how many significant figures are in each of the following numbers. a. 903 b. 903 c. 0903 d. 0903 e. 09030 f. 03 × 102 2. Round each of the following to three significant figures. a. 89377 b. 89328 c. 89350 d. 8997 e. 08907 3. Round each of the following to the stated number of significant figures.