How do you calculate osmotic pressure?

[Aschematic]

Calculate the osmotic pressure π for a concentration difference of 0.1 molar. (Ans 2.5 atm)

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What equation would you use?

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[299678]

Osmotic pressure = MRT * i
i = 1
so 0.1 * 0.0821 * 273 = about 2.5

 

[azar87]

easy way to remember is Pi=MARTI
pi=symbol for osmotic pressure
m=molarity
r=gas constant
t=temp
i=van hoft factor

 

[redchesus]

Osmotic pressure = MRT * i
i = 1
so 0.1 * 0.0821 * 273 = about 2.5

is i necessarily 1? it doesn't say what the solute is

and why is temperature at 273 K? (that's 0 C)... I always assume room temp if not given a temp (298 K)

can some explain?

 

[Mycuspidissharp]

(0.1)(0.0821)(273)(1) = 2.24133

(0.1)(0.0821)(298)(1) = 2.44658 ~ 2.5 [room temp is correct I would say]