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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.
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.
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 .
The volume occupied by a given mass of liquid varies with temperature, as does the volume of the device that holds the liquid. 20°C has been chosen as the normal temperature for calibration of much volumetric glassware. Glass is a fortunate choice for volumetric ware as it has a relatively small coefficient of thermal expansion;
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In addition, volumetric glassware is calibrated at a specific temperature, usually 20°C, but quite often it is used to deliver or contain volumes at a different temperature. These temperature variations make it necessary to adjust samples and/or standards to the calibration temperature before measurement, or to apply temperature corrections to ...
Jan 7, 2019 · General Directions for Calibration. – 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.
