[gmx-users] calculating ionic strength

[Mark Abraham]

jayant james wrote:
> Hi all !!
> I want to add 150mM KCl into a cubic box that contains a protein in an 
> aqueous environment. How am I to calculate as to how? many Ions of K and 
> Cl, I need to add to bring to the above said salt conc?

This sounds like a homework exercise for a first-year chemistry student! 
Work out the volume, then use the concentration to get a number of ions.

Mark