2006-11-25 13:35:14 · 3 answers · asked by Debbie S 1 in Science & Mathematics ➔ Chemistry
Of what?
π= i*C*R*T
T= absolute temperature (in Kelvin)
R= the gas constant in whatever units you need to express osmotic pressure (e.g. if you want π in atm then R=0.082 L*atm/(mole*K))
C= the concentration of your solute in mole/L
and...
i is the van't Hoff coefficient.
For non-electrolytes i=1
For strong electrolytes i= the number of ions that are produced by the dissociation according to the molecular formula e.g for NaCl you have 2 ions (1 Na+ and 1 Cl-) so i=2, for CaCl2 3 ions (1 Ca+2 and 2 Cl-) so i=3.
For weak electrolytes, if n is the number of ions coming from the 100% dissociation according to the molecular formula and a the degree of dissociation then i=(1-a)+na. E.g. if we assume for CH3COOH a=80% i=(1-0.8)+2*0.8= 0.2+1.6=1.8
2006-11-25 22:37:36 · answer #1 · answered by bellerophon 6 · 1⤊ 0⤋
Osmotic Pressure Formula
2016-12-12 17:16:10 · answer #2 · answered by herzog 4 · 0⤊ 0⤋
Osmotic Pressure Equation
2016-11-01 05:09:57 · answer #3 · answered by ? 4 · 0⤊ 0⤋
This Site Might Help You.
RE:
How do I calculate osmotic pressure?
2015-08-18 16:19:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
molarity = MRT molarity is given the pi sign. In these relationships, R = 8.3145 J/k mol is the normal gas constant and R'= 0.0821 L atm/K mol is the gas constant expressed in terms of liters and atmospheres.
Also visit http://chemistry2.csudh.edu/newlechelp/osmoticcs.html
2006-11-25 14:57:05 · answer #5 · answered by Ann 2 · 0⤊ 0⤋