Heating Curve Of Water Lab

Michael Elmer Physics Honors – 2 Partner: Michael Vaughan

Heating Curve of Water Lab Purpose To determine the heating curve of water by boiling ice that has been frozen in a test tube.

Materials • • • •

Hot Plate 400 mL beaker CBL Calculator w/PHYSICS or CHEMBIO programs

• • • •

Link cord DIN adapter Power supply Temperature probe frozen in test tube

Procedure 1. Assemble all your equipment. The probe should be the last thing you get. 2. Plug the probe into Channel 1, turn on the CBL, and enter PHYSICS program. 3. SET UP PROBES-ONE-TEMPERATURE-USE STORED CALIBRATION. 4. COLLECT DATA-TIME GRAPH-10 seconds between samples-90 samples-USE TIME SETUP. 5. LIVE DISPLAY. 6. Ymin=-10

Ymax=100 Yscl=5

7. Place beaker on hotplate. Turn hotplate to high. Start collecting data. 8. BE VERY CAREFUL NOT TO LET THE PROBE CORD YOUCH THE HOTPLATE!

Apparatus

Michael Elmer Physics Honors – 2 Partner: Michael Vaughan

Precautions Make sure that all non-members of your lab group are kept as far away from the lab as possible, as they will interfere with your ability to concentrate on the lab and they may cause an accident in your lab station. Likewise, make sure that you remain in your lab area. Although it is dreadfully boring to sit and watch ice melt for twenty minutes, you should remain diligent and make sure that everything is proceeding as it should.

Data [See Attached Graph]

Analysis 1. [See Attached Graph] 2. [See Attached Graph] 3. The portion of the graph where the ice is being heated has the highest slope for the domain. This fits because the specific heat capacity of ice is much less than that of water. 4. The period where there is no increase in the temperature of the water is because the ice is melting. Although heat energy is constantly being added, this energy is used to change the state of the substance from a solid to a liquid, instead of changing its temperature.

Error Analysis If the temperature probe comes into contact with a patch of water that is warmer or colder than average, there will be an odd curve in the graph. This may possibly have happened during my lab after the ice melted.

Conclusions The heating curve of water looks somewhat like my graph that was made from the data. I learned that the flat part of the graph is where water changes state. Also learned that the slope of the graph when the substance had its temperature raised was related to the specific heat capacity of the substance.