CHM 11200 Lecture Notes - Lecture 6: Molar Concentration

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8 Feb 2017
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Lecture #6 1/26/2017
Wednesday, February 08, 2017
5:28 PM
Ethanol with water
Potential for disorder increases
Energy change negative (exothermic dissolution)
Water and ethanol form hydrogen bonds with themselves and with each other
Hydrogen bond
Intermolecular force
Covalent bond
Intramolecular force
Break dispersion forces and H-bonds in ethanol
Break H-bonds and dispersion in water
Make equivalent H-bonds and dispersion forces in solution
Factors affecting solubility
Vitamin A
o Very nonpolar
o All carbon basically
Vitamin C
o Very polar
o Lots of OH groups
1. Intermolecular forces
a. Polar molecules
i. Water soluble
ii. Hydrophilic
1. Vitamin B
2. Vitamin C
3. Water soluble
b. Non-polar molecules
i. Soluble in non-polar molecules
ii. Hydrophobic
1. Vitamin A
2. Vitamin D
3. Vitamin K
4. Vitamin E
5. Fat soluble
2. Temperature effects aqueous solutions
a. Depends on dissolution being endothermic or exothermic
b. Aqueous solubilities of most solids increase with increasing temperature some decrease
with temperature
c. Solubility of some solids as a function of temperature
3. Gases: pressure effect
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