Exp 1_Use of Analytical Equipment and Glassware

• The graduation of this type of pipettes is continued to the tip (maximum volume includes the volume in the tip).

  Serological Pipet
• is used to determine the mass of an object.

  digital electronic analytical balance
• Volatile liquid samples must be weighed in a closed container to prevent evaporation
• To reduce mass variations caused by air currents, the balance pan is frequently cased under a wind shield
• Special test tubes or centrifuge tubes must be used that exactly fit the width of the chambers in the centrifuge.
• Each tube should be filled to no greater than three-quarters full as the samples will be tilted in the centrifuge and could spill out
• More than one sample can be centrifuged at a time, with the only requirement being that each opposing tube must have nearly the same volume
• Although a centrifuge has a braking mechanism, it is not recommended to use it as the jostling can stir up sediments.