What is "Strongness" parameter in Acidic pKa calcu

 Hi,

 

I am currrently using JChem for Excel ,can nyone pls tell wat is "Strongness" parameter in Acidic pKa calculation?

looking forward to your reply,

Multiprotic molecules have more than one ionizable atom, and so they can have more than one acid dissociation constant. See the attached image. With "Strongness = 1" setting the strongest acidic pKa is calculated, with  "Strongness = 2" setting the second strongest acidic pKa, and so on.

Zsolt