Quote Originally Posted by Kirk Keyes View Post
Ray - if you've been following along for the last couple years, you would have remembered that pX is useless when there is a mixture of halides in the system. What does that number tell you when there's a mixture?

Thus, pAg is measured instead.
pX is used only as a placeholder...
It indcates only that we could be talking about any halogen,
even mixtures.