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Hi Prabhakar

If you look at the Handbook of Chemistry and Physics (CRC press) you 
will find tables of densities for various salts and other solutes  e.g. 
a 7.2% (wt) NaCl solution has a density of 1.0500 kg/l at 20oC. Also, if 
your solution crystalizes 'after a while' you are probably losing water 
from evaporation as its listed solubility (Merck Index) is 140g/l at 20oC..

Cheers Mark

B. Prabhakar Pandian wrote:

> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Hello,
> We are trying to keep some polystyrene particles neutrally buoyant in 
> water/PBS, etc. Is there a way to increase density of the solution to 
> 1.05 (density of polystyrene particles).
> We are using inositol to increase the density but we are having 
> problems with crystallization after a while.
>
> Thanks,
>
> -Prabhakar