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Experiment 1- Buret Preparation and Calibration

Experiment 1- Buret Preparation and Calibration -...

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Experiment 1: Buret Preparation and Calibration Abstract : A buret was prepared and calibrated for use in future experiments. The first part involved determining the value of drops/mL of water and the second part involved finding the correction for a range of volumes. The drops/mL was calculated to be 18.40 ± 0.88 drops/mL In buret calibration, the average correction value was 0.09 mL and the created is shown in Table 13. Both parts of the experiment seemed to provide poor results. Introduction In doing quantitative measurements, instruments such as pipets, pH meters, and volumetric flasks are used. But, one important instrument in doing quantitative measurements is a buret which dispenses known volumes of liquid. Although the buret can deliver known volumes, it can never be exact due to the presence of indeterminate error which is error that will always be present in an experiment due to limitations in the procedures and the equipment used (so for example, one can never deliver the “exact” amount of liquid with a buret due to the thickness of the marks on the buret and the human eye’s inability to detect when the “exact” volume has been delivered). But as said, this is unavoidable and thus must be accepted. One type of error that must be avoided when using a buret however is determinate (systematic) error which is bias in measurements which leads to measured values being systematically too high or systematically too low. The bias can come from the environment, methods of observation, and the equipment used. So in the instance of a buret, when it is produced from the manufacturer the marks may not be accurate thus the reading of the volume may be different from what was actually obtained. Because of this, determinate errors must be eliminated or minimized. In the case of the buret, it can be calibrated so that the reading of the volume can be properly adjusted to present its true value. The first part of this experiment (Part A) involves preparing the buret for use and using it to determine the volume of per drop of water. From this its reciprocal, drops per 1 mL of water (drops/volume), will be determined The second part of this experiment (Part B) involves the calibration of the buret. The procedure involves delivering a certain amount of water and comparing the volume reading to its actual volume which will be determined from the mass of the water and the density of it. It’s important to note however that the density of water changes with temperature. So the temperature of the water will be noted and the density at that temperature will come from a table of values (Table 14) which are corrected for buoyancy. By comparing the reading to the actual value over a range of volumes, adjustments can be made and can thus be used for further experiments which involve the usage of the buret. Experimental
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Experiment 1- Buret Preparation and Calibration -...

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