Hi Cramster Family, Q: Warm distilled water was used instead of roomtemperature
ID: 677960 • Letter: H
Question
Hi Cramster Family, Q: Warm distilled water was used instead of roomtemperature distilled water in the calorimeter. Would there be no change in the water because the water wouldabsorb the same heat from the metal, and the end result would bethe same temperature? Hi Cramster Family, Q: Warm distilled water was used instead of roomtemperature distilled water in the calorimeter. Would there be no change in the water because the water wouldabsorb the same heat from the metal, and the end result would bethe same temperature?Explanation / Answer
There would be a slight change in temp. Mostcalorimetric operations involve a temperature change, since theheat liberated (or absorbed) during the process is stored in thecalorimeter and its contents by virtue of their combined heatcapacity. Thermocouples, thermopiles and resistance thermometersare commonly used for temperature measurements. The quantity ofenergy liberated or absorbed in a calorimetric process is evaluatedin terms of electrical energy.
Calibration of calorimeters may be done by use of three similarmethods. (1) In an exothermic process where heat is liberated, thecalorimeter is cooled to the original temperature; the temperaturerise is then duplicated using an electrical resistance heater.
(2) In an endothermic process heat absorbed is supplied by anelectrical heater at such a rate as to keep the temperatureconstant. (3) In heat-capacity measurements, the electrical energyis supplied directly by a heater. Electrical energy and temperaturecan be measured very accurately by modern methods, but the problemof heat transfer between the calorimeter and its environment ismore difficult. The minimization of; and accurate correction for,heat exchange is the major problem to be reckoned with in moderncalorimetry