Volumetric Measurements

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Presentation transcript:

Volumetric Measurements

Volumetric measurements Basic units of volumetric measurement is liter (abbreviation is letter L – upper or lower case) 1 mL = 1 cc 1 mL of water weighs 1 g 1 liter of water weighs 1 kg Consider the purposes of common glassware:

Beakers: Mixing and dispensing Wide mouth, good for stirring but hard to seal for storage Lip, good for pouring mL graduations, if present, are VERY approximate; neither accurate nor precise

Conical (Erlenmeyer) Flasks: Mixing and storing Shape is good for swirling to mix solutions. Narrow mouth is easy to seal for storage (using stopper or Parafilm). Not as easy to pour things into or out of it, compared to a beaker. Like a beaker, graduations are neither accurate nor precise.

Graduated cylinders: Measuring Cylindrical shape gives good precision and accuracy. Graduations can measure any volume within the size range of the cylinder. Not an ideal shape for mixing, but it can be done. (More on this when we discuss making solutions.)

Smaller volumes: Pipettes Glass/plastic pipettes 1 mL, 5 mL, 10 mL, 20 mL

Pipette