The weighing procedure


  • The right scale for the measurement:
    • Maximum capacity and precision
  • Choosing the right container and lab tool for sampling
    • Sabot-spatula pairs, volumetric flask-pipette adapted to the physical state of the compound to be weighed.
  • Prepare the scale: cleanliness of the plate, surroundings, level, and tare.
    • Use a brush to clean the scale and its environment: ensure the absence of contaminants that are likely to affect the measurement.
    • Check the horizontality of the scale with a spirit level
    • Make sure the scale is calibrated with calibration weights
    • Tare or record the exact mass of the container
Transcript : French English
  • Sample small quantities of the product with a spatula or pipette until reaching the target quantity
    • Product safety code (might be necessary to work under a fume hood)
    • Solid or liquid sampling
    • Put the sample in the container
    • Record the exact mass (closed container in the case of volatile compounds)
    • Successive additions up to the desired mass
Transcript : French English
  • Record the exact mass
    • The displayed value must be stable: the sliding windows of the scale must be closed. Take a precise reading of the displayed mass.
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