Purpose:
The purpose is to evaluate the heat changes in thermochemical reactions.
Procedure When flipping a reaction, the enthalpy will change in
sign.
Reaction photo**
The enthalpy is delta H= -212.8 Kcal The
Initial temp Tap water & Calorimeter: 22.5 degrees C
negative sign shows that heat is given off=
Initial Warm Water bath temperature: 38.0 degrees C
exothermic
0 seconds: 22.5 C
Second reaction photo**
15 seconds: 29.6 C
CaCO3 --> CaO + CO2 +42.4 Kcal
30 seconds: 29.8 C
CaO + CO2 --> CaCO3 -42.4 Kcal
45 seconds: 29.8 C
Heat capacity
Highest temp of mixing: 30.0 degrees C
Third photo**
Delta T tap = 30-22.5= 7.5
1. Obtain 50 ml of water and pour it into a Styrofoam
303K- 295.5 = 7.5 K
coffee cup calorimeter, and let it sit to calibrate with
the calorimeter.
Delta T warm = 38-30 = 8 C/ 8K
3. Obtain another 50 ml of water and place it into the
water bath with 40 degrees Celsius, and let it set for 5
minutes.
5. Take both temperatures with a thermometer. 6.
Pour the water from the water bath into the
calorimeter.
6. Read the temperature every 15 seconds.
Second reaction photo**
Endothermic= heat must be taken in for the reaction to
take place.
CaCO3 --> CaO + CO2 +42.4 Kcal
CaO + CO2 --> CaCO3 -42.4 Kcal
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