About adding neutralising ions

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Hi guys,

I added neutralising ions to a silica surface using the nano material modeller on CHARMM. I suspected that the VMD files would contain only SOD (sodium) and CLA (chloride ions) but I also have POT (potassium ions) present in my VMD plot. Is there particular reason why?

CHARMM-GUI defaults to KCl as the neutralizing species. You can change it to NaCl when preparing your files, or simply by replacing POT with SOD in all your inputs.