Lab Report: Calibration of Volumetric Glassware

Topics: Measurement, Laboratory glassware, Density Pages: 9 (1654 words) Published: April 28, 2014
Calibration of Volumetric Glassware

Nur Farah Nabilah Binti Ahmed Zhaini
Muhammad Imanuddin Bin Azman
Maisarah Binti Alias

Summary
In this experiment, The purpose of this experiment is to investigate the measurement of the actual volume contents of volumetric glassware. In the beginning of the experiment, the volumetric glassware should be clean and dry before used. The volumetric glassware, measuring cylinder and pipette should be handled with care and all the precautions were be taken during the experiment was held. This was to ensure to avoid any errors such as parallax error especially while reading water meniscus. This experiment must be repeated three times or more and take the average reading to get more accurate data. By using the formulae, the standard deviation and relative standard deviation could be calculated. As the result, the lower the standard deviation, the higher the consistency of an instrument. Although the instrument may measure a given sample, the value might need to be altered due to various conditions and errors.

Objectives

The objective of the experiments was to;
Calibrate a 10 mL volumetric pipette.
Calibrate a 25 mL volumetric pipette.
Calibrate a 100 mL volumetric flask.
Calibrate a 50 mL measuring cylinder

Introduction
Volumetric glassware is used to accurately measure volumes. Despite all of the tools and instruments available for the use of measuring values of various data, it is impossible to measure the true value of anything. This experiment is intended to develop a person’s capacity to handle volumetric glassware. One must understand how to handle volumetric glassware to acquire the best possible data from the equipment used in lab. Although the instrument may measure a given sample, the value might need to be altered due to various conditions. However, with practice and experience, we can reach very close to the true value, gaining the ability to measure with both high accuracy and precision. The objective of this experiment is to calibrate a 10mL burette and other volumetric glassware by calculating their correction values. By doing so, we can correct systematic errors caused by the burette’s or glassware’s values. A systematic error is an error in reading the scale when a physical quantity is being measured. Systematic errors are caused by the instrument, observer and surroundings. Another main type of error is random error. Random error is an error which occurs when the observer is reading the scale on the measuring instrument.

Volumetric glassware is used to accurately measure volumes. In any given experiment, students may come across systematic errors or random errors. Random errors are not able to be corrected by a standard mean because they are not consistent. However, systematic errors are consistent and is able to be detected which allows students to correct the error that was found. So, using uncalibrated glassware will cause a systematic error. This error occurs because the volume reading given by the glassware is slightly different than the actual volume that is obtained in the glassware. In order to avoid systematic error, it important to calibrate the measuring instrument so that there is a standard value for zero which allows the measurement to be more accurate. Calibration of volumetric glassware such as burette is carried out by weighing the amount of water delivered. The temperature of the water used in the calibration must be known since the density of water changes.

The purpose of this experiment is to investigate the measurement of the actual volume contents of volumetric glassware. If there is a slight variation in this instrument, it would cause systematic error and thus, the accuracy of results of an experiment or investigation would be affected. All volumetric glassware has marking on it. It is either being marked with TD or TC, which brings the meaning of ‘to deliver’ and ‘to...


References: * http://gula-gulakapassikecik.blogspot.com/2012/04/calibration-of-volumetric-glassware_24.html?m=1
* www.studymode.com
* Lim Peng Chew, Lim Ching Chai, Nexus Bestari Physics, Sasbadi Sdn. Bhd. , 2013, Pg 18,19
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