Experiment 12: Calorimetry

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| | |Experiment 12- Calorimetry and Hess’s Law | | | | | |Jenna Hyde | |Lab partners: Mariam Aboulela, Charles Stewart | |3/21/2012 |

Date submitted: 3/23/12

CHM1045L- section 21

TA: Francisco Alvarado

| |

Purpose

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.

Procedure

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 | | |...
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