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20 °C
- 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. Fortunately the correction is very small within a few degrees of 20 °C and can be neglected in ordinary work.
web.pdx.edu/~atkinsdb/teach/321/CALVOL.pdfCalibration of Volumetric Glassware - Portland State University
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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 · In the case of the glassware used in general chemistry lab, both the 10 mL volumetric pipet and 50 mL volumetric flask will have two significant figures (sig figs) after the decimal point (i.e. 10.00 mL and 50.00 mL), for a total of four significant figures each.
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.
indicate volume. This is because they are made to measure just one specific volume. In the case of the glassware used in general chemistry lab, both the 10mL volumetric pipette and 50mL volumetric flask will have two sig figs after the decimal point (i.e. 10.00mL and 50.00mL). For the 150mL beaker and the kitchen measuring cup, assume that 50 ...
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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 .
Oct 27, 2022 · To be sure measurements are correct it is a good idea to keep water, balance and calibrated glassware in the same room long enough to be sure everything have the same temperature. Room doesn't have to be thermostated, although temperature should not change during the calibration process.
Jan 6, 2015 · New glassware is slightly alkaline in nature so soak in slightly acidic solution e.g. in 1% \ (HNO_3\) or HCl for an hour, then rinse with distilled water. Cleaning machines save time when bulk cleaning is required.
