CHM exp report 4

# CHM exp report 4 - CHM 151 Experiment Report Student's name...

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CHM 151 Experiment Report Student’s name : Lai Shin Zie ID : I08001607 Partner’s name : Nicholas Chai ID : I08001107 Section : 5A Lecturer’s name : Dr. Palsan A/L Sannasi @ Sannach Due date : 13 June 2008

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06 June 2008 Experiment 4 : Thermochemistry and Hess’s Law Aim : 1. To determine the heat capacity of the coffee-cup calorimeter. 2. To determine the enthalpy change of the reaction between NaOH and HCl . 3. To determine the enthalpy change of the reaction between NH 3 and HCl. 4. To determine the enthalpy change of the reaction between NaOH and NH 3 Cl. Procedure : Please refer to the laboratory manual page 36 to 37. Results : Take the density of water and all solutions to be 1.0 g/mL. Take the specific heat capacity of water and all solutions to be 4.18 J/g°C. A. Heat Capacity Of The Calorimeter Mass of warm water : 50g Initial temperature : 50 °C Mass of cool water : 50g Initial temperature : 22.5 °C Table 4.1 The temperature of the mixture of warm water and cool water. Temperature (°C) after 30 s 60 s 90 s 120 s 150 s 180 s 210 s 240 s 35.2 35.1 35 35 34.9 34.9 34.8 34.8
Final temperature : 34.8 °C Figure 4.1 Graph of temperature of the mixture of warm water and cool water against time. B. Heat Of Acid-Base Reaction (a) Reaction Between NaOH and HCl Mass of 2.0M NaOH : 20g Initial temperature : 22 °C Mass of 2.0M HCl : 20g Initial temperature : 23 °C Mean initial temperature : 22.5 °C Table 4.2 The temperature of the mixture of

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CHM exp report 4 - CHM 151 Experiment Report Student's name...

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