CALORIMETER
Thermodynamics: it is the study of the relationship among different forms of energy (enthalphy (ΔH), entropy (ΔS), and free energy (ΔG).
Gibb’s Free Energy equation
ΔG=ΔH - TΔS
Calorimeter:
Theory: To measure the heat given off during a physical or chemical reaction
q=mCΔT
q= heat
m= mass in grams
c= specific heat capacity
ΔT= change in temperature measured in Kelvin
Procedure for a Bomb Calorimeter:
1) Set-up Calorimeter: Insulated water bath, thermometer, ignition wires and sample plate
2) Add magnetic stirrer
3) Measure out sample using a spatula and electronic balance calibrated to four decimal places
4) Record initial temperature
RECORD: Initial temperature
5) Add sample to sample plate in Calorimeter
6) Ignite the sample using electricity connected to the sample plate
7) Record the final temperature
RECORD: Final temperature
8) Calculate: the change in temperature: (Final temperature- initial temperature)= ΔT and plug into heat equation:
q=mCΔT
Gibb’s Free Energy equation
ΔG=ΔH - TΔS
Calorimeter:
Theory: To measure the heat given off during a physical or chemical reaction
q=mCΔT
q= heat
m= mass in grams
c= specific heat capacity
ΔT= change in temperature measured in Kelvin
Procedure for a Bomb Calorimeter:
1) Set-up Calorimeter: Insulated water bath, thermometer, ignition wires and sample plate
2) Add magnetic stirrer
3) Measure out sample using a spatula and electronic balance calibrated to four decimal places
4) Record initial temperature
RECORD: Initial temperature
5) Add sample to sample plate in Calorimeter
6) Ignite the sample using electricity connected to the sample plate
7) Record the final temperature
RECORD: Final temperature
8) Calculate: the change in temperature: (Final temperature- initial temperature)= ΔT and plug into heat equation:
q=mCΔT