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Jan 30, 2024 · Use the density for your temperature to calculate the volume of water delivered by your pipette in each determination, the mean volume, the standard deviation, and the 50% and 95% confidence limits for the mean.
By convention, volumetric glassware is always calibrated at 20 °C. Since the temperature at which you do the calibration may be somewhat different there is a small correction for the cubic coefficient of expansion of glass.
Volumetric glassware is used to either contain or deliver liquids at a specified temperature. Glassware manufacturers indicate this by inscribing on the volumetric ware the initials TC (to contain) or TD (to deliver) along with the calibration temperature, which is usually 20°C 1 .
Jun 17, 2023 · 10 mL volumetric or graduated pipet. Obtain a dry 50 mL beaker and determine its mass. For each type of glassware, deliver 10.00 mL to the 50 mL beaker. For the buret, record initial and final buret readings in a table along with the amount of water delivered to the beaker.
- Calibration of Volumetric Flasks
- Calibration of Single Volume Pipettes
- Calibration of Burettes
Weigh empty, dry flask. Fill it with distilled water to mark. Weigh again. Mass difference is the mass of water. Repeat 3-4 times.
Weigh empty, dry, closed weighing bottle. Pipette water into the bottle, close, weigh again. Mass difference is the mass of water. Repeat 3-4 times. In both cases use your results to calculate average mass. Quite often single volume pipette and volumetric flask are used together - diluted sample is pipetted from the flask to carry on separate titra...
Burettes can be not only wrong (within allowed tolerance), but the error can depend on the volume delivered. Thus we will need not a single number, but either a table or a plot of corrections. To prepare it, repeat the same procedure for each multiply of 5.00 mL (5.00 mL, 10.00 mL, 15.00 mL...): 1. Weigh empty, closed weighing bottle. 2. Use burett...
According to USP <31> most of the volumetric apparatus available in the US are calibrated at 20 C despite temperatures prevailing in most analytical laboratories typically approaches 25 C, which is the temperature specified for the majority of the Pharmacopeial assays.
Jan 7, 2019 · – All volumetric ware should be painstakingly freed of water breaks before being calibrated. – Burets and pipets need not be dry, but volumetric flasks should be thoroughly drained and dried at room temperature. – The water used for calibration should be in thermal equilibrium with its surroundings.
