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Molarity & Molality
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Molal
Pertaining to the number of moles of solute per
kilogram
of
solvent
Molar
Pertaining to the number of moles of solute per
liter
of
solution
1 Molar solution (1.0M)=
1 mole of solute dissolved in 1L of solution
Doesn't specify exact amount of H20
1 Molal solution (1.0m)=
1 mole of solute dissolved in 1kg H20
Osmolality (Osm)
Total molality of a solution
ex
: 1.0m of NaCl yields a 2 Osm solution, because NaCl dissociates into Na+ + Cl-
Tonicity
Is effect of a solution (sln) on osomotic movement of H2O
Isotonic solution (2 solutions)
Have tsame osmotic pressure
Hypertonic solution
Have higher osmotic pressure & are osmotically active
** Hypotonics have lower osmotic pressure
Isosmotic solutions
Have same
osmolality
as plasma
Hypo-osmotic solutions
Have lower osmotic pressure than plasma
* hyperosmotics have higher pressure than plasma
Regulation of blood Osmolality
Blood osmolality maintained in narrow range around 300m Osm
If dehydrated, osmoreceptors in hypothalamus stimulate
: ADH release (which cause kidney to conserve H2O) & Thirst
Author
rleighn25
ID
99276
Card Set
Molarity & Molality
Description
Ch. 6 Molarity and Molality
Updated
2011-09-01T01:57:14Z
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