Report 1 - Volumetric Glassware Calibration Section...

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Volumetric Glassware Calibration Section: CHM3120C-903 Vincent Gallo U61917512 Partner: Shane Spiers January 25 th , 2016
I. Introduction In order to become proficient with the functioning of several different volumetric measuring devices, proper techniques will be practiced to achieve accurate calibration. Following the “weighing by difference” technique, an analytical balance will be used to determine the average weight of a U.S. quarter-dollar coin. A 5 mL volumetric pipette will function as a medium for transferring water so that the water’s mass and volume can be calculated. Finally, water will be released from a 50 mL burette so that its volume can ultimately be calculated. With respect to the second and third parts of the experiment, the tolerance of the measuring devices will be taken into consideration. A device’s tolerance is a manufacturer’s stated uncertainty in the accuracy of a device, such as a volumetric pipette or a volumetric burette. Depending on the varying temperature at the time of the experiment, the actual volume a device contains could deviate measurably from the readings on the device. If the techniques for using the volumetric glassware are followed correctly, then the weight of the coin can be correctly calculated, the volume of water delivered from the volumetric pipette can be calculated within the proper tolerance range, and the volume of water delivered via the 50 mL burette can be calculated correctly, within the range of the tolerance rating for the device.
II. Experimental Procedure To begin the initial portion of the experiment, zero the analytical balance and weigh the weigh paper to the nearest 0.0001 gram. Then, place the coin on to the balance with the weigh paper, and tabulate the weight of each to the nearest 0.0001 gram. After that, calculate the mass of the coin, and repeat the previous two steps another two times in order to calculate the average mass of the coin. Finally, calculate the standard deviation of the results. For the second part of the experiment, obtain a 250 mL beaker and fill it with distilled water. Record the temperature of the distilled water to the nearest 0.01°C.

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