Calibrating A 50 Ml Buret Lab Report

This sample essay on Calibrating A 50 Ml Buret Lab Report offers an extensive list of facts and arguments related to it. The essay’s introduction, body paragraphs, and the conclusion are provided below.

The accuracy of the measurement the volumes is the degree of closeness of measurements of a quantity’s actual volumes while the precision of the volumes is the degree to which repeated agreements under unchanged conditions show the same results. Each of volumetric glassware is marked with its total volume, the notation of AD for ‘to deliver’ and ETC for ‘to contain’ and also with the temperature at which the calibration applies.

For greatest accuracy, volumetric glassware should be calibrated to measure the volume that is actually contained in or delivered by a particular piece of glassware.

The calibration is done by measuring the mass of water contained in or delivered by the glassware. The density of water at a particular temperature is used to convert mass into volume.

Pipettes and burette’s are calibrated to deliver specific volumes whereas, volumetric flasks are calibrated to contain basis. MATERIAL AND PROCEDURE The materials used in the experiment were:- 10 ml volumetric pipette 25 ml volumetric pipette 100 ml volumetric flask 50 ml measuring cylinder Distilled water Plastic dropper 100 ml beaker 250 ml beaker The procedure 1.

Calibration of a volumetric pipette ( 10 ml and 25 ml ) a) An empty ml beaker was weighed to the nearest milliard using electronic weigh balance. B) The ml pipette was filled to the mark with distilled water. C) The water was drained by gravity (remove pipette bulb or pump) into the beaker and caps the bottle to prevent evaporation.

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D) The bottle was weighed again to find the mass of water delivered from the pipette. E) Then used the following equation to convert mass to volume. F) The above procedure was performed on each of the pipette. G) The experiment was repeated for 2 times.

Why Do We Need To Calibrate Volumetric Glassware

The calibration was done by measuring the mass of water contained in or delivered by the glassware. The density of water at a particular temperature which is measured is used to convert mass into volume. Pipettes is calibrated to deliver specific lumen whereas volumetric flasks are calibrated on a contain basis. BRIEF THEORY: In this experiment, we were exposed to a variety of important concepts related to quantitative experimentation, including the proper use of measuring cylinder, volumetric glassware, analytical balances and statistics.

We calibrated a volumetric pipette that was where experimentally determined what volume a pipette or flask really delivers. We also calibrated a beaker and 50 ml burette. A table was constructed according to the result. In this experiment, accuracy and precision is important. The brief theory of calibration of glassware is accuracy and precision. Accuracy is the degree of closeness of measurements of a quantity’s actual volumes while the precision of the volumes is the degree to which repeated measurements under unchanged conditions show the same results.

For the accuracy and precision of the measurement, scientists need to calibrate their volumetric glassware periodically. Calibration of Volumetric Glassware experiment is designed to help participants to learn both theories and practical skills to effectively calibrate and verify their volumetric glassware. The mass of water, container and temperature is measured and recorded. From the data recorded, we can observe that all the experiment results are not in accurate and stable. For the Mimi pipette experiment, the result is increase from Trial 1 to Trial 2 but decrease from Trial 2 to Trial 3.

Then for the ml pipette experiment, the result is decrease from Trial 1 to Trial 2 but from Trial 2 to Trial 3, the result is increase. After that, for ml volumetric flask the result is decrease from Trial 1 to Trial 2 but increase from Trial 2 to Trial 3. For ml measuring cylinder, the result is decrease from Trial 1 to Trial 3. When the results are compared to he theory, we can conclude that our result for experiment is not accurate but precise. It is not accurate because of the different pressure from surrounding.

But then, the results are precise because all the measurement recorded shows the same results. From this experiment, there are possible error occur. Firstly, error occurs during measure on electronic weigh balance. Second, the apparatus is not dry and cleaned in a proper way. Third, parallax error occurs during measure the apparatus. CONCLUSION In conclusion, this experiment is conducted to investigate how to calibrate the quid accurately and precisely by using volumetric glassware. In order to study the problem, we did three complete trials for each of the calibration of volumetric glassware.

My results showed that the trial with the highest relative standard deviation was 100 ml volumetric glassware while the lowest greatest relative standard deviation was 50 ml measuring cylinder. This can conclude that the accuracy of the volumetric glassware is affected by the sensitivity of the instruments. In order to overcome the error, we have to make sure that the eye position is perpendicular to the reading scale of the apparatus to avoid parallax error. Besides that, the beaker should be clean and dry properly so that there is no water left which can affect the mass of the next trial.

Apart from that, the volumetric glassware should be weight properly in order to get the accurate and precise results. APPENDIX Questions 1 . Please tell in simplest way what calibration is….. Calibration is a comparison between measurements which is known as magnitude or correctness made or set with one device and another measurement made in as similar a way as possible with a second device. 2. Draw a flowchart for the calibration of 50 ml measuring cylinder. . With the reference to the capacity of the glassware you have chosen, give a set of reading to illustrate the meaning of good accuracy and poor precision.

With reference to the capacity of the glassware you have chosen, give asset Accuracy is how close the measurement is to the actual measurement. Good accuracy and poor precision means the readings of the measurements are not particularly close to each other but the readings are close to the actual reading of the glassware chosen. Example: The capacity of the measuring cylinder is ml. The measurements taken: 48. Ml, 50. Ml, 49. Ml, 47. Ml, ml, 50. Ml. This distribution shows no impressive tendency toward a particular value (lack of precision) but each value does come close to the actual volume (high accuracy). . What does standard deviation, o, indicate? The standard deviation is a measure that summaries the amount by which every value within a dataset varies from the mean. Effectively it indicates how tightly the values in the dataset are bunched around the mean value. It is the most robust and widely used measure of dispersion since, unlike the range and inter- quartile range; it takes into account every variable in the dataset. When the values in a dataset are pretty tightly bunched together the standard deviation is small.