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Science Lab Tech

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Submitted By nanakay92
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CHEM 321 Experiment 1
Basics Review and Calibration of Volumetric Glassware
There are three types of containers used in lab to contain or deliver liquids: volumetric, ordinary, and disposable glassware. Volumetric glassware are containers that have been calibrated at a specific temperature to deliver or contain VERY PRECISE amounts of liquid. Examples of volumetric glassware that we will use include burets, pipets, and volumetric flasks. Ordinary glassware has less precise volume calibrations and are used whenever the volumes do not have to be measured as accurately. Examples include beakers, Erlenmeyer flasks, and graduated cylinders. Disposable glassware (or plastic ware) is used to transfer or hold liquids temporarily and may not contain any volume markings. Examples include medicine droppers and disposable pipets. In this experiment you will be exposed to a variety of important concepts related to quantitative experimentation, including the proper use of glassware, analytical balances, and statistics. You will calibrate a volumetric pipet or flask, that is, you will experimentally determine what volume a pipet or flask really delivers. You will also calibrate a beaker or Erlenmeyer flask and a 50 mL buret. You will use these calibrated values throughout the remainder of the quarter. Construct a table at the front of your laboratory notebook to record calibration values or tape in the calibration tables from Chapter 2 of Harris’ 7th edition.

How to read the level of liquid in glassware:
The “meniscus” of a liquid refers to the curvature of the liquid surface in a narrow container. If the surface of the liquid is concave (as in water), the liquid level is measured using the bottom of the meniscus. If the surface is convex (upward curving) as in mercury, the liquid level is read from the top of the meniscus. It is important to position the eye at the same level as

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