[diablo]

Hi, i got following problem:

Calculate the difference in osmotic pressure between capillary blood and the tissue fluid
Assume that this difference arises because of the protein serum albumin, in the blood (concentration= 7%,Mr 66000),which is absent in the tissue fluid.(Ignore the Donnan effect)

R= 0,082, K = 310


i would calculate it this way:  P = cxRxT  = 7%x0,082x310   --> is this correct ?^^

thx
Diabloo

[allanf]

I think the concentration should be in molarity not percent, but otherwise that's what I would do.

[diablo]

thx for your answer  , yes i think it's not 100% correct^^

maybe this :

1mol...66000g
xmol...70g( cause 7% of 1L)

--> c = 0,0010 mol/L

this sounds better for me ^^ , and then cxRxT = p

right?^^

thx diabloo

[allanf]

looks right to me.

An easy way to remember the equation for osmotic pressure is that it is the same as the ideal gas law:
pV = nRT -> p = cRT, just that now it concerns the solute contained within the solution.

[diablo]

thx man