Lec-9: Solutions; concentration & dilution
Roy A. Lacey, Stony Brook University;
Che 131, Spring 2012
1
Solutions
E
th’
f
75%
d b
`
Earth’s surface ~ 75% covered by
water; depressions in Earth’s
crust filled with 1.5
×
10
21
L of
H
2
O(
l
).
`
Properties of water responsible
f
lif
E
th
d
for life on Earth, and many
geographical features.
`
All natural waters (fresh or
All natural waters (fresh or
saltwater) have ionic and
molecular compounds dissolved
i
h
in them.
Roy A. Lacey, Stony Brook University;
Che 131, Spring 2012
2
Solutions
S l ti
I
t
t
Solutions are Important
Most of the Chemistry which makes life possible
occ r in aq eo s sol tion
occur in aqueous solution
Medicine
Agriculture
Etc.
Solution:
Solute + Solvent
S l
S l
l
l
C
d
Solute:
Salts, Molecular Compounds
Solvents:
Water, Organic, etc
Change concentration by using different
Change concentration by using different
amounts of solute and solvent
Roy A. Lacey, Stony Brook University;
Che 131, Spring 2012
3
Solutions
S l
i
`
Solutions:
•
Homogeneous mixtures
of two or more
of two or more
substances:
»
solvent = substance
present in the greatest
present in the greatest
quantity
»
solutes = substances
dissolved in the solvent (
i e
i.e.
,
the other ingredients in the
mixture)
Aqueous solutions
`
Aqueous solutions
→
water is solvent
Roy A. Lacey, Stony Brook University;
Che 131, Spring 2012
4
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- Spring '08
- Kerber
- pH, Roy A. Lacey
-
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