Introduction to the Analytical Balance
ABSTRACT The objectives of the experiment include illustration of the use of analytical balance, studying the precision of weighing made with it and evaluating the common error encountered in weighing. Weight of the vial, the cap, vial with cap and the vial that was induced with the factors affecting the sensitivity of the balance (e.g. moisture) were determined. As seen, there were significant differences on the weights though there were some errors observed. Expected results were not seen because of certain influences that somehow affected the precision and accuracy in weighing. All in all, the objectives of the study were met.
The analytical balance is a fundamental
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The results were 20.2981 g and 2.0041 g respectively. The dry vial was weighed again with its cap and got 22.3020 g. It can be observed that the sum of the mass of the vial and the cap that were weighed separately earlier is almost equal to the mass when the dry vial and the cap were weighed together. In the next step, the dry vial without the cap was reweighed and got 20.2978 g. But when we rolled the vial around in our hand, the mass dropped to 20.2977 g it may be because of the moisture already transferred to the hands. After this, the vial was dried with the use of tissues and was reweighed again and here we got 20.2975 g probably because the mass of the moist present earlier in the vial were removed using the tissue. Lastly, when we held the vial in the mouth and was breathed on it several times, we got 20.2977 g, only to confirm that the measurement of the earlier ‘seemingly’ dry vial has moisture on it and isn’t completely dry at all. Perfect results were obviously haven’t get, this may be because of certain influences that somehow affected the precision and accuracy when weighing. One of the reasons is probably the environment itself. Factors like the air temperature, humidity and even the slightest vibrations can affect the weighing in the analytical balance. Moreover, it can also be blamed to some instrumental error, such as faulty calibrations and usage of some inappropriate materials. This all together can cause an error. Carelessness or personal errors