The aim of this experiment is to accurately prepare a potassium dichloride solution with various concentrations. We initially hypothesized that a higher concentration solution would result in a greater spectrophotometer reading. The results strongly support this hypothesis, despite a slight error in the spectrophotometer reading. The higher concentration solution yielded a reading of 1.066, while the lower concentration had a reading of 0.224.
To ensure precise measurements, we utilized volumetric glassware with low parallax error and specific markers. If the mark on the glassware is surpassed, it indicates a parallax error caused by the position and angle of the eyes towards the mark. Although this may lead to incorrect measurements, they still fall within an acceptable margin of error [5].
To calculate percent error, fill the mill volumetric flask up to the mark and add an a
...dditional 1 ml to surpass it and cause the meniscus to exceed as well. In this scenario, if you accidentally exceeded the mark by 0.1 cm, should you discard your solution? The percent error can be determined using this formula: (Expected value - Observed value) / Expected value * 100%. In this specific scenario, there was a percentage error of 0.2% [4], which does not warrant discarding the solution.
The accuracy of volumetric glassware is dependent on its calibration temperature, as referenced in 4. This means that temperature can impact the accuracy of volumetric flasks. Comparing mill and LLC demonstrates a slight percentage error in the accuracy of volumetric flasks. According to reference 4, ICC is typically the optimal temperature for precise functioning of volumetric flasks. It should be noted that ordinary beakers, conical flasks, and laboratory bottles with volume markings ar
not considered as volumetric glassware because they do not provide precise and accurate volume measurements like specialized pieces used in laboratories do. Their markings generally have a range of about 5%.
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