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Development of a semi-adiabatic isoperibol solution calorimeter.
R Venkata Krishnan1, G Jogeswararao1, R Parthasarathy1
1Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India.
The Review of Scientific Instruments
|January 3, 2015
Summary
A new semi-adiabatic isoperibol solution calorimeter was developed for precise heat measurement. This advanced system achieves high accuracy (within ±3%) for thermochemical studies.
Area of Science:
- Thermochemistry
- Calorimetry
- Physical Chemistry
Background:
- Accurate measurement of heat changes is crucial for understanding chemical reactions.
- Existing calorimeters may have limitations in sensitivity or calibration.
Purpose of the Study:
- To indigenously develop a semi-adiabatic isoperibol solution calorimeter.
- To enhance measurement sensitivity and accuracy for thermochemical applications.
Main Methods:
- Utilized a sensitive thermistor with a lock-in amplifier for enhanced temperature measurement.
- Employed a microcontroller and LabView-based software for system control and data acquisition.
- Implemented a summing amplifier to cancel thermistor base resistance and calibrated using a PT100 sensor.
- Determined calorimeter water equivalent via electrical calibration with a joule calibrator.
Main Results:
- Successfully developed and validated a semi-adiabatic isoperibol solution calorimeter.
- Achieved measurement uncertainty within ±3% for heats of dissolution.
- Demonstrated accurate measurement of both endothermic (KCl) and exothermic (tris) dissolution heats.
Conclusions:
- The developed calorimeter provides a sensitive and accurate platform for thermochemical measurements.
- The indigenous design offers a cost-effective solution for heat measurement studies.
- The system's accuracy is suitable for validating thermodynamic data.
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