2: Analytical Balances
- Page ID
- 347229
Analytical balances are used to measure the mass of a substance. The instructions describe the use of the balances in the Science Lab Building rooms 270 & 280. Always record your data to the precision of your instrument. If you are told to weigh 2 grams and the precision of your instrument is 100\(\micro\) grams, report it as 2.0000g.
Never pour chemicals on the balance, always use a weighing boat or weighing paper.
Step 1
-The analytical balance measures the mass of substances to within 0.0001g.
-The balance must be dry and contain no extraneous materials that may affect the accuracy of the measurement.
-Place the weighing paper onto the balance pan and close the side doors. To make sure the weight is stable, wait for the mass to stop changing or for a green triangle to appear.
-Press the “tare” button to recalibrate the balance to read 0.0000g. This prevents the mass of the weighing container from being included in the measurementFigure \(\PageIndex{1}\): Copy and Paste Caption here
Step 2
-Open the door and use a spatula to add the substance up to the desired mass. NEVER PLACE CHEMICALS ON THE BALANCE PAN
-Once again, close the door and then record the mass once the scale has stabilized.
-Do not to lean on the balance while weighing!
Step 3
-After finishing the measurements, brush the area around the balance pan to clean it of any remaining substance particles or spills.
-Discard any weighing paper.
-Keep the balance room clean!