Boiling Point Elevation
1. Find a 1 or 2 quart saucer pan and a small drinking glass (make of glass). Make sure that the glass is able to easily fit inside the saucer pan and not be more than 25%-50% of the volume of the saucer pan. DO NOT USE A GOOD GLASS. SOMETIMES THEY WILL BREAK.
2. Fill the saucer pan approximately 1/2 full of tap water. Add as much table salt (NaCl) to the water as you can without leaving a significant amount of table salt on the bottom of the pan.(stirring speeds up the process).
3. Add tap water (no table salt) to the glass until it is approximately 1/4 full.
4. Carefully put the glass into the saucer without the two liquids from mixing. If they mix, you need to repeat Step 3 over again.
5. Now heat both liquids on the stove.
6. Make your observations as you watch the two liquids come to boil.
Observations
Questions:
Which liquid (table salt solution or "pure water") boiled first and why?
2. Prepare a salt solution as in Step 2 of the Boiling Point Elevation section of lab.
3. Add the salt solution to 1/2 of the ice cube tray. LEAVE ONE SET OF CUBES DEPRESSION BETWEEN THE TWO LIQUIDS.
4. Add pure water to the other 1/2 of the ice cube tray.
5. Carefully, place the ice cube tray into the freezer.
6. Periodically, observe what is happening to the liquids in the ice cube trays. Record your observations.
Observations
Questions
Which liquid (salt solution or pure water) froze first and why?