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Chemical Measurements: Tools and Techniques for Laboratory Work

Explore the essential tools in the chemistry lab, from volumetric flasks to burets and pipets. Learn about calibration, cleaning procedures, and measurement precision for accurate results in chemical experiments.

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Chemical Measurements: Tools and Techniques for Laboratory Work

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  1. Reading: Chapter 2 – an informative review • Chemical measurements: Tools of the trade – hardware and labs • VISIT THE LAB • Safety Lab notebook • Introduction to instruments and lab-ware

  2. Safety

  3. Protection

  4. Analytical balance

  5. ~ 0.0001 g

  6. ng - Quartz crystal microbalance (p29)

  7. Glassware • Burets • Pipets • Volumetric flask

  8. Volumetric flask

  9. Volumetric flask • Volumetric flasks are carefully calibrated to contain a given volume of liquid at a given temperature when filled to the calibration mark on the neck. The flasks are usually accurate to four significant digits. It is imperative that volumetric glassware be scrupulously clean. Wash volumetric flasks with soap and water, rinse several times with tap water, and rinse at least 5 times with small portions of distilled water (5 - 10 mL each) delivered from the wash bottle, taking care to wash around the neck.

  10. Pipets

  11. Pipets • Pipets • The most common pipet used in the analytical chemistry lab is the volumetric pipette. Volumes commonly range from 1.000 mL to 50.00 mL. Each volumetric pipette has a calibration mark around the neck. Many pipettes are marked with the temperature at which they were calibrated, and some are marked with the time in seconds in which they should drain.

  12. CHAPTER 02:Figure 2.16

  13. Buret

  14. Burets • Buret • Burets, like pipettes, are calibrated to deliver a measured volume. This volume is controlled through the use of some type of valve, which may be a teflon or glass stopcock or, in the case of the Mohr buret, a piece of rubber tubing containing a glass bead. Commonly, the capacity of the buret is 50.00 mL. Calibration marks are given for each 0.1 mL, so that the buret may be read to the nearest 0.01 mL.

  15. Glassware

  16. CHAPTER 02:Table 2.5

  17. Autotitration

  18. CHAPTER 02:Figure 2.22

  19. What I need to do • Read and make notes about the glassware • Identify tolerances • Understand density dependences • Read about the smallest balances p 20 • Later practice Excel problem 2-11 p.35

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