Volumetric Glassware
DISCUSSION Calibration is very essential in determining and getting the most accurate result especially for the laboratory glassware. Volumetric glassware need to be within the specified tolerance in order for it to be accurate. Since not all glassware having the same size, volume or etc., for sure, calibration need to be done. In this experiment there are three types of volumetric glassware that needed to be calibrated to determine its accuracy and precision. The volumetric glassware are burette, pipette and volumetric flask. Each calibration were repeated three times in order to gain a more precise result. In part A, pipette calibration was done. This was done whether the volume transferred from the pipette is exactly of what was shown …show more content…
The actual volume of water differs as a very small amount of water might being left out in the pipette hence, make the actual volume of water differs. From all of the actual volume of water being transferred, the average obtain is 24.71ml. So, the volumetric glassware, pipette is considered as accurate and precise since it transferred approximately 25ml of water. In Part B, the calibration of burette was done. Burette can actually transfers water more accurate compare to pipette and micropipette. The burette calibration were done using 5ml, 10ml, 15ml, 20ml and 25ml of water. Each volume of water was repeated three times to obtain a more accurate result. When the experiment is conducted, the mass of the empty Erlenmeyer flask is taken before each trial. For the nominal water volume of 5ml, apparent mass of water for Trial 1, Trial 2 and Trial 3 are 5.064g, 4.976g and 4.945g respectively. The true mass of water of each trial are 5.070g, 4.982g and 4.951g respectively. Since all three trials have the same temperature, the density is 0.997296g/ml. After calculation, the actual volume of water being transferred for Trial 1 is 5.084ml, for Trial 2 is 4.996ml and for Trial 3 is 4.964ml. The average of water transferred is …show more content…
Three trials has been done for this experiment. For Trial 1, Trial 2 and Trial 3, the apparent mass for each trial are 99.330g, 99.261g and 98.741g respectively. After calculation, the true mass has been obtained and for each trial, the mass recorded are 99.449g, 99.380g and 99.859g respectively. As the temperature for all trial is 24.0˚C, the density of water being recorded is 0.997296g/ml. Finally, the actual volume of water being transferred after calculations are 99.717ml, 99.649ml and 99.127ml respectively. The average for the actual volume of water being transferred is
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