Molarity & Molality

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

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Card Set

Molarity & Molality

Description

Ch. 6 Molarity and Molality

Updated

2011-09-01T01:57:14Z

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