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Lecture 1

CHM1311 Lecture 1: CHM 1311 Lab #1.docx


Department
Chemistry
Course Code
CHM 1311
Professor
Wendy Pell
Lecture
1

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Student Number: __________________________________
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Demonstrator's Name: _______________________________
PLEASE NOTE: If ANY of the above information is UNCLEAR or not provided, your grade
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Lab Day (circle):Tues aftTues night Wed Thurs aft Thurs night Fri
Lab Week (circle): 1 2
Laboratory Report Form
Experiment 1.
Determination of the Composition of an Alloy
Checklist:
oRaw Data Sheet written in pen, signed by TA
and attached
oReport Form completed in pen (or typed) and
attached Students Initials _____

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Data Tables
Table 1. Pure Metal
Data Trial 1 Trial 2
Identity of Metal Zinc (Zn) Zinc (Zn)
Mass of metal (g) 0.0581 0.0496
Uncalibrated volume of eudiometer
(mL) N/A
Pre Calibrated N/A
Pre Calibrated
Volume of hydrogen gas (mL) 22.81 19.51
Height of water column (cm) 30.85 33.65
Density of water (kg/m3) 999.97 999.97
Acceleration due to gravity (m/s2)
9.81 9.81
Pressure of water column (Pa)
3026.29 3300.97
Water Temperature (C) 19 19
Water Vapour pressure (Pa) 2200 2340
Atmospheric Pressure (Torr) 755.2 755.2
Pressure of Hydrogen 95458.76 Pa 95044.083 Pa
Room Temperature 18°C 18°C
Ideal Gas Constant, R 8314.462 8314.462
Actual Moles of Hydrogen (mol)
0.000896858 0.000761168
Theoretical moles of Hydrogen (mol)
0.000888243 0.000758293
Percent Yield (%) 101 100.3
Observations (Part 1):
The HCl took seconds to reach the bottom of the Eudiometer tube to react with the zinc.
During the reaction, Hydrogen gas was produced in the form of small bubbles. As the
production of Hydrogen gas increased, all of the zinc metal disappeared at the end of the
reaction.
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Table 2. Alloy
Data Trial 1 Trial 2
Unknown Number 3140 3140
Mass of alloy (g) 0.0389 0.0418
Uncalibrated volume of eudiometer
(mL)
N/A
Pre Calibrated
N/A
Pre Calibrated
Volume of hydrogen gas (mL) 23.51 24.29
Height of water column (cm) 27.00 27.68
Density of water (kg/m3) 999.97 999.97
Acceleration due to gravity (m/s2)9.81 9.81
Pressure of water column (Pa) 2648.62 2715.33
Water Temperature (C) 20 20
Water Vapour pressure (kPa) 2.34 2.34
Atmospheric Pressure (Torr) 755.2 755.2
Pressure of Hydrogen 95696.43 Pa 95629.72 Pa
Room Temperature 18°C 18°C
Ideal Gas Constant, R 8.314 8.314
Moles of Hydrogen (mol) 0.000923571 0.000953548
Mass of Zinc (g) 3.08x10-2 3.40x10-2
Mass of Aluminum (g) 8.15x10-3 7.80x10-3
Percent Zinc (%) 79.2 81.3
Percent Aluminum (%) 21.0 18.7
Average Percent Zn = 80.3% Al = 20.0%
Observations (Part 2):
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