The purpose of this lab is verify Hess’s Law.
Calculated the quantity of NaOH to prepare 1.0 M NaOH solution. Obtained a clean and dry calorimeter and recorded weight which was 17.615g. 100mL of water was added to the calorimeter. The calorimeter was weighed again. The mass of the calorimeter with water was 115.048g. Measured out the mass of of about 4.00g of NaOH and used a mortar and pestle to grind it into a powder. Added the NaOH to the calorimeter. The temperature was recorded and the calorimeter was weighed again. The quantity of heat transferred to the dissolution of NaOH in the water was recorded.
A clean 150mL beaker was weighed and mass was recorded to 73.661g. 100mL of 1.0 M HCL was obtained and placed in the beaker. The beaker was weighed for a 2nd time which had a mass of 174.323g. The temperature was taken and recorded. The temperature of the NaOH solution in the calorimeter was measured which was 34.9 degrees Celsius. The two solutions were the mixed in the calorimeter and temperature was recorded after two minutes. The quantity of heat transferred to the neutralization of NaOH and HCL was recorded.
A calorimeter was cleaned and dried and mass was recorded as 17.594g. 100mL of solution was put in a calorimeter. The calorimeter and HCL solution a mass of 121.829g. The temperature of the HCL solution was recorded. Measured out the mass of of about 4.00g of NaOH and used a mortar and pestle to grind it into a powder. The temperature of the solution was measured until it was constant. The calorimeter was reweighed again and mass was recorded. The quantity of heat transferred to the neutralization of NaOH and HCL was recorded.
Please refer to attached sheet.
Hess’s Law states that a chemical process is independent of the path taken from the initial to the final state. Hess's law can be used to find the energy...