To determine if a Styrofoam cup calorimeter provides adequate insulation for heat transfer measurements, to identify an unknown metal by means of its heat capacity and to determine a heat of neutralization and a heat of solution.
To perform simple calorimetry experiments. To use calorimetry results to calculate the specific heat of an unknown metal...
Heat and work are the two most common ways for a system to exchange energy with its surroundings...
1 400 mL beaker, 2 Styrofoam cups with lid, 1 18 × 150 mm test tube, 1 test tube holder, 1 150 mL beaker, 1 250 mL beaker, 1 50 mL beaker, 2 100 mL graduated cylinders, 1 hot plate...
~20 g metal unknowns, ~50 mL 1.5 M NH3, ~50 mL 1.5 M H3PO4, ~10 g NH4H2PO4, deionized water
Phosphoric acid is corrosive. It can attack the skin, cause permanent damage to the eyes, and cause burns...
All solutions may be flushed down the sink with plenty of water. Do not put the metal samples in the sink...
Prior to Class
Please review the following video: Safety...
Start the MicroLab Interface and calibrate the thermistor as described in the MicroLab instructions provided in the lab...
You will use a hard copy of this worksheet to enter data as you work through the experiment in lab. Print the worksheet and bring it with you to the lab.