Difference between revisions of "Colligative Properties Exp"
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| Line 7: | Line 7: | ||
Chemical principles: | Chemical principles: | ||
:- molality (m) = moles of solute/kg solvent [similar to molarity (M)] | :- molality (m) = moles of solute/kg solvent [similar to molarity (M)] | ||
| − | :- cryoscopic constant ( | + | :- cryoscopic constant (k<sub>f</sub> = ...for freezing, k<sub>b</sub> = ...for boiling) (see list [https://en.wikipedia.org/wiki/List_of_boiling_and_freezing_information_of_solvents here]) |
:- van't Hoff factor = an integer value indicating the number of solute particles resulting. | :- van't Hoff factor = an integer value indicating the number of solute particles resulting. | ||
| − | :- ΔT = k<sub>f</sub> | + | :- ΔT = k<sub>f</sub> or k<sub>b</sub> * m * i |
Demonstration: | Demonstration: | ||
| Line 15: | Line 15: | ||
Experiment: | Experiment: | ||
| − | :- temperature of various salt water solutions. | + | :- temperature (T) of various salt water solutions (m). |
| − | :- Graph data and | + | :- Graph data (m vs T), trendline/linear regression fit, determine cryogenic constant k<sub>f</sub>, and print and turn in to instructor. |
Latest revision as of 16:57, 21 August 2020
Colligative Properties include:
- - Boiling point elevation
- - Freezing point depression
- - vapor pressure decrease
- - osmotic pressure alteration
Chemical principles:
- - molality (m) = moles of solute/kg solvent [similar to molarity (M)]
- - cryoscopic constant (kf = ...for freezing, kb = ...for boiling) (see list here)
- - van't Hoff factor = an integer value indicating the number of solute particles resulting.
- - ΔT = kf or kb * m * i
Demonstration:
- - Seltzer water...
Experiment:
- - temperature (T) of various salt water solutions (m).
- - Graph data (m vs T), trendline/linear regression fit, determine cryogenic constant kf, and print and turn in to instructor.