Date submitted: 3/23/12
CHM1045L- section 21
TA: Francisco Alvarado
The main purpose of this lab was to understand certain concepts of thermodynamics, such as Calorimetry and Hess’s Law, in order to determine the enthalpy of a reaction. The experiment required learning how to construct and use a calorimeter to measure the enthalpy of a reaction, and also how to use a thermometer to record temperature. It also demonstrated how to use different equations to calculate heat, work, enthalpy, and energy.
Dillon, Stephanie. “Calorimetry and Hess’s Law.” Laboratory Manual. Pearson Publishing, 2012, pp. 163-182.
Data and Results
|Table 1: Heat Capacity of Calorimeter | | |Volume (mL) |Temperature (degrees |Volume (mL) |Temperature (degrees | | |Trial 1 |Celsius) |Trial 2 |Celsius) | | | |Trial 1 | |Trial 2 | |Cold Water (in |50.0 |22.5 |50.0 |23.7 | |Cup) | | | | | |Hot water (in |50.0 |54.0 |50.0 |51.0 | |cylinder) | | | | |
|Table 2: ΔHrxn of Mg in HCl | | |Volume (mL) |Temperature (degrees |Description |Mass(g) | | | |Celsius) | | | |HCl (in Cup) |100.0 |23.0 |Clear bubbles formed and |n/a | | | | |the liquid started smoking| | |Mg |n/a |n/a | |.185 |
|Table 3: ΔHrxn of MgO in HCl | | |Volume (mL) |Temperature (degrees |Description |Mass(g) | | | |Celsius) | | | |HCl (in Cup) |100.0 |23.5 |The water got really foggy|n/a | | |...