Lab report calibration of volumetric flask

2011 words 9 pages
OBJECTIVES

The objective of the experiment was
To calibrate a 10 mL volumetric pipette
To calibrate a 25 mL volumetric pipette
To calibrate a 100 mL volumetric flask
To calibrate a 50 mL measuring cylinder

INTRODUCTION

The purpose of this experiment is to study the relationship of several types of volumetric glassware and the accuracy of measuring the volumes of liquids very precisely in quantitative laboratory work. 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 measurements under unchanged conditions show the same results.
Each of volumetric glassware is marked with its total volume,
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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 10ml pipet experiment, the result is increase from Trial 1 to Trial 2 but decrease from Trial 2 to Trial 3. Then for the 25ml pipet 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 100ml volumetric flask the result is decrease from Trial 1 to Trial 2 but increase from Trial 2 to Trial 3. For 50ml measuring cylinder, the result is decrease from Trial 1 to Trial 3.
When the results are compared to the 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.
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