ChemistryWiki | RecentChanges | Preferences
Showing revision 7
Boiling Point Elevation
1) What phrase do you have to memorized to know that the salt solute dissolves (called dissociates) in the water solvent.
2) From your lecture notes, explain in words what happens when solid sodium chloride solute dissolves into the polar solvent water.
3) From your lab data, calculate the Molarity (mole Na1Cl1)/liter Na1Cl1 solution) of the salt solution. Please show all appropriate work especially work to show molar mass of Na1Cl1 (It is 59g Na1Cl1/1moleNa1Cl1).
4) From your lecture notes, do you predict that the salt solution or water will boil first?
5) Did you submerge the salt solution container in the water container or visa versa?
6) Which one boiled first, salt solution or water? How long did it take to boil?
7) How long after first "solution" boiled did the second "solution" boil?
8) Did your lab results support or disagree with what you would expect from your lecture notes (answer to Question 3). Explain.
9)
4. Is the boiling point of solvent Greater than, Less than or Equal to the boiling point of the solution. Explain why in words.
Freezing Point Depression
5. Is the freezing point of the solvent Greater than, Less than or Equal to the freezing point of the salt solution. Explain why in words.
6. If I added the same amount of sugar to the same amount of water as you did with the salt, would it have the same freezing point depression (assume the solubility is the same). Explain.