[highachiever]

hi!

does anyone know what the osmolarity (mosmol/l) of 100 mM (mmol/l) d-mannitol and 50 mM dimethyl sulfoxide is?
ive already figured that 150 mM of nacl is 300mosmol/l.

merci & best regards

- r

[Borek]

If you have calculated osmolality for NaCl solution, can't you apply the same approach to the substances in question?

[highachiever]

that's my problem.
wikipedia says cacl's osmorality is twice as high as its morality.
but then i came across another forum post that says that na2so4 osmorality is three times higher than morality because of its dissolution in water .
in addition, d-mannitol and dimethyl sulfoxide are much more complex ...

[Borek]

wikipedia says cacl's osmorality is twice as high as its morality.

CaCl? No such compounds, If you mean CaCl₂ it should be thrice. It depends on the dissociation and van 't Hoff factor.

in addition, d-mannitol and dimethyl sulfoxide are much more complex ...

Actually they are much simpler in the context.

[highachiever]

oh no i'm sorry I meant nacl from my previous message.

yes, i know that osmorality mainly depends on the dissociation of the molecules (i didn't have the van't hoff factor in school ...), but i don't seem to find it online ... how exactly can i find out the osmorality of both molecules?

[Orcio_87]

Did you try using the google ?:

https://en.wikipedia.org/wiki/Van_%27t_Hoff_factor