Boiling Point and Melting Point Lab
Problem:
Hypothesis: If I melt ice and boil water, then the temperature at which water (ice) melts is and the temperature at which water boils is .
Materials:
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Procedures:
1. Set-up the following the diagram below:
2. Place mL of in a beaker.
3. Place the beaker on the next to the firewall.
4. Insert the clamp into the and place the thermometer into the ice with the tip just above the bottom of the beaker. Tip of must be near the bottom but not touching the bottom or sides!
5. Take the temperature of the and record the temperature. This is t=0 (or the starting temperature).
6. Raise your hand and have come and light the burner.
7. Place the burner the beaker and the stand and beginning recording the every minute in the data table.
8. On your data table, indicate the time when you first notice the ice .
9. Continue recording the temperature. Indicate on your data table when the water starts to (many bubbles breaking the surface).
10. Continue recording the temperature every minute until the water has boiled for minutes.
11. Clean up and put away the .
12. Draw a using the data table. On the graph, indicate when the occurred and when the water .
Data:
1) Fire wall set-up drawing
2. Chart 3. Graph of
* indicate melting point & boiling pt on both the table & graph
Time(minutes) / Temperature / Class Average temperature
Analysis Questions:
1. Does your hypothesis match your data for the water’s boiling and melting points? Explain.
2. Which came closer to the known boiling point and melting point of water- your data or the class average data?
3. What are some factors that may have caused the class average to differ from the known boiling points and melting points of water?
4. Was there a dip in temperature during the observation? What could account for the dip in temperature?
Conclusion: (follow RERUNS)