PASCO ET-8499 User Manual
Instructions
Activities
Experiments
Instruction Manual
No. 012-08808A
Energy Transfer Calorimeter
ET-8499
Energy Transfer Calorimeter Model No. ET-8499
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Activity 1:
Electrical Equivalent of Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Activity 2:
Calorimetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Experiment 1:
Heat of Fusion of Ice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Experiment 2:
Entropy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Teacher’s Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Copyright and Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Model No. ET-8499 Energy Transfer Calorimeter
®
Energy Transfer Calorimeter
Model No. ET-8499
1
5
2
4
3
Included Equipment Replacement Part Number
1. Outer cup
2. Inner cup
3. Heating resistor assembly
4. Insulating spacer
5. Lid
6. One-hole stopper (not shown)
7. Experiment setup CD (not shown)
648-08748
648-08747
003-08803
648-08750
648-08749
699-129
013-08983
1
Energy Transfer Calorimeter
®
Introduction
The Energy Transfer Calorimeter incorporates the classic design of two nested aluminum cups
with an air space in between for insulation. Instead of the traditional coil, a 10 ohm, circuit-boardmounted heating resistor is provided for heating water. However , the unit can also be used without
the heating resistor. The size of the calorimeter cup has been scaled to work well with any 1 amp,
10 volt power supply. Typical applications include the calorimetry of mixtures, the heat of fusion
of ice, and the electrical equivalent of heat.
Component specifications
• The outer aluminum cup is a holder and acts as an insulator. Its mass does not need to be
included in any calculations.
• The inner calorimeter cup is made of aluminum, and its mass should be included in heat
transfer equations.
• The heating resistor is permanently mounted in a two-hole stopper, where the second hole
provides access for a temperature probe. The cable end plugs directly into a power supply
with banana terminals.
• The insulating spacer aligns the inner and outer cup to leave a small air space in between that
acts as an insulator. The spacer rests on the step inside the outer cup.
• The insulating lid features a hole for a rubber stopper. A #2, one-hole stopper is included that
can be used to hold the temperature probe when the heating resistor is not used.
Activities
The two copy-ready labs included with this manual cover the topics of calorimetry of mixtures,
latent heats of transformation, and entropy. The experimental setups do not specify the type of
thermometer used. This allows the instructor the flexibility to utilize any available equipment.
2
Model No. ET-8499 Equipment Setup
®
Equipment Setup
Important!
• Never apply power to the heating resistor unless the resistor is immersed in water.
• Never touch the resistor. It gets hot!
• Do not apply more than 10 volts.
1. Place the spacer inside the larger, outer cup so it is seated on the lip.
2. Place the inner cup into the outer cup through the hole in the spacer.
3. Place the lid on top.
4. Feed the heating resistor assembly through the hole in the lid. Fit the stopper snugly into the
hole to insulate the system and to hold a temperature probe. Note: If the heating resistor is not
being used, insert the one-hole stopper to insulate the system and to hold a temperature probe.
3
Energy Transfer Calorimeter Equipment Setup
®
4
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