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Experiment 2 Calibration of
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FACULTY OF APPLIED SCIENCE DIPLOMA IN SCIENCE
CHM 256 NAME: 1. NURUL FAZNILA MAKMUR (2011285662) 2. NURsemester HAZRIANI HAMRI (2011254362) Master your with Scribd 3. SITI MUAFIFAH & The New York TimesAMSAH (2011231684) Special offer for students: Only $4.99/month.
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EXPERIMENT 1 CALIBRATION OF GLASSWARE
OBJECTIVE
To calibrate a 100 mL volumetric flask.
INTRODUCTION
The calibration of glassware is performed by letting o ut a volume of water into a flask. The volume is determined by weighing the flask and calculating the water volume by using its density from temperature. A correct calibration should allow rando m volume to let out.
You're Reading a Preview The tolerance value for a 100 mL volumetric flask is ± 0.1 mL. If the deviation value for th full access with ainfree flask is greater than 0.1 mL then theUnlock volumetric flask thetrial. laboratory. This method can use calibrate other glassware like burette and p ipette. Download With Free Trial APPARATUS
100 mL volumetric flask, dropper, glass rod, rule Master your semester with Scribd & The New York Times Special offer forMATERIAL students: Only $4.99/month.
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PROCEDURE
1. A 100 mL volumetric flask is cleaned and dried.
2. A 1 x 2 cm label paper is cut and pasted on the volumetric flask so that the middle li coincides with the mark on t he flask. 3. The empty volumetric flask is weigh accurately.
4. The volumetric flask is filled with distilled water up to the o riginal mark carefully by
using a dropper when reaching t he mark. The inside neck o f the volumetric flask is w
dry with tissue paper with the help o f a glass rod. The volumetric flask is weigh with content accurately.
5. The volume of water in the volumetric flask is calculated based on the room tempera and data given in Table 1.1. This is exact volume of the volumetric flask.
6. If the volume obtained is not the same as the volume labelled o n the flask [100 mL],
a new mark 5 mm is made above and below the original mark on the label paper on t flask.
You're Reading a Preview 7. If the volume is less than 100 mL, water is added using a dropper but if the volume o Unlock full access with a free trial.
more it will be weigh again and the new volume is calculated.
8. Exact distance is determinedDownload by using the distance/volume ratio from the original ma With Free Trial label the new mark that should read a volume of 100 mL at laboratory temperature. RESULT
Master your semester with Scribd 1. Weight of empty volumetric flask, w = 57.2238 Read gSign upFree Foron 30this Days to vote title Weight Times of volumetric flask + water, w = 156.5488 g & The New2. York Useful Not useful 1
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3. WOnly eight of water, ( w2 w1 ) = 99.325 g Special offer for students: $4.99/month.
4. Volume of water = 99.325 × 1.0038 = 99.70 mL
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DISCUSSION
1. In this experiment, we are required to test the accuracy of vo lumetric flask and mark the volumetric flask with new calibration mark if inaccurac y occurs.
2. The volume of water we o btained when we poured water inside the flask until the calibr mark of 100mL volumetric flask was 99.70 mL, less 0.3mL than the volume it supposed be.
3. These may be due to : a. Volumetric flask used contain dust/ not properly cleaned b. The water contains impurities.
4. To mark the new calibration mark for the volumetric flask, we add more water until it reaches 5mm above the ca libration mark. This time the volume is still inaccurate with 0. You're Reading a Preview volume of water more than what it supposed to be. Unlock full access with a free trial.
Download With Free Trial 5. Therefore to calculate the exact 100 mL mark we used the distance/volume ratio, which results the new calibration mark is 1.9mm above t he original calibration mark of the volumetric flask.
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