How do you know what salt to use for salt bridge?

[ppppparker]

Homework Statement

its not a homework question but I didn't know where else to ask.
I want to know how we know which salt to use for salt bridge. I think I understand what we don't want the salt bridge to do --we don't want it to react, and that its function is to neutralize the solution so anions or cations don't build up and the cell stops working. So salt bridge replenishes the ions, right?
But how do we know which salt won't react? Is it a matter of comparing reduction potentials?
thanks for any help!

Homework Equations

The Attempt at a Solution

 

[Bystander]

don't want it to react

... and, that said, things turn into a "crap-shoot." "Everything" reacts (or is totally inert). "Artful" selection yields "minimal" effects. Cells "with transport" are more difficult in which to accomplish this goal.