Lab report calibration of volumetric flask Essay

2010 Words Oct 24th, 2013 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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50mL measuring cylinder

Trial 1

Trial 2

Trial 3
Mass of container + water (g)
116.80
116.78
116.73
Mass of container (g)
67.57
67.76
67.78
Mass of water (g)

49.05
49.02
48.95
Temperature (°C)
32
32
32
Actual volume (mL)
49.34
49.30
49.23
Average volume (mL)

49.29
Standard deviation, σ
0.055678
Relative standard deviation (σ/
1.1296 × 10-3

DISCUSSION
The purpose of the experiment of calibration of volumetric glassware is to calibrate certain measurement by using 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 volumes 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
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