# How do I predict the spontaneity of an ionic metathesis reaction? [closed]

How do I predict the spontaneity of a metathesis reaction?

Is it a matter of summing up the differences between their ions' standard reduction potentials?

Take the salt metathesis reaction between two dissolved electrolytes; sodium chloride and silver nitrate (highlighted here). While the HSAB theory exists, it has not been quantified yet (as far that I know of).

Based my current knowledge of Chemistry, I would expect something like this:

Let the symbol of each element represent its standard reduction potential. Then spontaneity would be given by the following:

$\ce{((-Na) - (-Ag)) + (Cl - NO3)}$

Where a positive value would imply that the reaction is spontaneous, and the magnitude the degree of spontaneity.

• Your question is confusing - I have no idea why you're mixing simple precipitation with redox - there's no redox in there! – Mithoron May 9 '15 at 15:01
• @Mithoron: Read about salt metathesis reactions here. – Vatsal Manot May 9 '15 at 15:18
• I'm well aware how metathesis works and it's driven by precipitation or vaporisation or complexation – Mithoron May 9 '15 at 17:53