Pasco Xplorer-GLX Users’ Guide Manuel d'utilisateur Page 117
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Xplorer GLX Users’ Guide 111
Activity 2: Melting Point Depression
Background
How does the addition of salt affect the melting point of a solution? In this exper-
iment, you will measure the temperature over time of frozen salt water and pure
water as they melt. From the recorded data, you will identify and compare the
melting points of both liquids.
Pre-lab: Prepare Frozen Solutions
Prepare the frozen solutions at least one day in advance.
1. Make a solution of 1 g NaCl in 100 ml of deionized water. Add enough to a
test tube to fill it to a depth of about 1 cm.
2. Add the same amount of deionized water to a second identical test tube.
3. Place a fast-response temperature probe in each test tube. The ends of the
probes should be immersed. Use tape to secure the probes in place.
4. Label both test tubes and label the connectors of both probes for easier iden-
tification.
5. Place both test tubes (along with the probes) in a freezer.
Before You Begin
Start a new experiment on the GLX.
1. Press to go to the Home Screen.
2. Use the arrow keys to highlight the Data Files icon and press to open
the Data Files screen.
3. Press to open the Files menu and press to select New File.
4. When the GLX asks if you would like to save the previous file, press
to save or not to save.
Equipment Quantity
Xplorer GLX
1
Fast-response Temperature
Probes
2
Test Tubes
2
Test Tube Rack
1
Deionized Water
110 mL
NaCl
1 g
Temperature
Probe
Tape
to be connected
to the GLX
F4
1pqrs
F1
F2
- Users’ Guide 1
- About this Guide 2
- Technical Support 2
- How to Store the 3
- Contents 5
- Introduction 9
- Included Equipment 10
- Quick Start 11
- Overview of the GLX 12
- Shutting Down 13
- The Record Button 14
- Home Screen 15
- Bottom Row 16
- 12 Overview of the GLX 18
- Chapter 1: Displays 19
- Active Fields 20
- Choosing Data to Display 21
- Data Cursor and Coordinates 22
- Graph Function Keys 22
- Scale and Move with a Mouse 23
- F3 Tools Menu 23
- F4 Graphs Menu 28
- Data Annotation 31
- Annotation Menu 32
- Note Editor Dialog Box 33
- To Open the Table 34
- Table Scrolling 35
- Table Function Keys 35
- F2 Edit Cell 36
- F4 Tables 37
- Manually Entered Data 38
- Editing an Existing Data Set 40
- Xplorer GLX Users’ Guide 35 41
- 36 Table 42
- Digits Display 43
- To Open the Meter Display 44
- Auto Scale and Reset 44
- Chapter 2: Utility Screens 45
- Output Settings 46
- Calculator 47
- Algebraic Calculations 48
- Graphing Equations 50
- Sensor-based Calculations 51
- Calculation 52
- Calculator Function Keys 54
- F2 [Data] 55
- F3 Graph 55
- Output-control Calculations 56
- Special Functions 57
- Output-control Functions 57
- Logic Operators and Functions 58
- Audio Temperature Indicator 58
- Notes Screen 59
- Stopwatch 60
- Chapter 3: Settings and Files 61
- Sensor Settings 62
- Sensors Function Keys 63
- F3 Microphone 64
- ScienceWorkshop 65
- Manual Sampling Mode 66
- Timing Screen 68
- Constants 69
- Measurements 69
- Working with Multiple Timers 70
- Timing Screen Function Keys 70
- Digital Adapter Options 73
- 68 Timing Screen 74
- Data Properties 75
- Calibration 77
- For step-by-step 78
- After offset calibration 79
- 74 Calibration 80
- Calibration Procedures 81
- 76 Calibration 82
- Data Files Screen 84
- Navigating in the File List 85
- Data Files Function Keys 86
- Move or Copy File 87
- RAM and Flash 88
- File Size Limits 88
- File Transfer 89
- Backup and Restore GLX Files 89
- GLX-to-GLX File Transfer 90
- Settings Screen 91
- Language Options: 92
- Settings Screen Function Keys 93
- 88 Settings Screen 94
- Data Source Menus 95
- Multipress Text Input Mode 96
- Using a USB Keyboard 96
- Scientific Notation 97
- Printing 97
- 92 Printing 98
- Operation 99
- GLX Storage 100
- Battery Disconnection 100
- Battery Capacity 101
- Resetting 102
- Operating Temperature 103
- 98 Operating Temperature 104
- GLX with DataStudio 105
- Transferring Files 106
- File will be uploaded to 107
- 102 GLX with DataStudio 108
- GLX Simulator 109
- Screen Capture 110
- Screen Mirroring 110
- Sample Activities 111
- Activity 1: Calorimetry 113
- Analysis 114
- Xplorer GLX Users’ Guide 109 115
- 110 Calorimetry 116
- Background 117
- Before You Begin 117
- Procedure 118
- Data Collection 123
- 120 Newton’s Law of Cooling 126
- Variation 127
- GLX Set-Up 130
- Place the dashed box 135
- 134 Capacitor Discharge 140
- Interference 141
- Activity 10:Beat Frequency 143
- 140 Beat Frequency 146
- Shortcut Summary 149
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