Posted by mel on Friday, November 2, 2007 at 6:51pm.
For reactions of this type, look for any ONE of three things.
1. a precipitate is formed. You will need a table of solubilities.
2. a gas is formed. You need to know which elements/compounds are gases.
3. a weak electrolyte (slightly ionized compound) is formed. You need to know weak acids and weak bases; generally, those are the ones with Ka or Kb. H2O is a slightly ionized material also.
For example,
AgNO3 + (NH4)2CO3 ==>
Look at the ions. We will have Ag^+, NO3^-, NH4^+ and CO3^=.
Looking down your table of solubilities, I know immediately that Ag2CO3 is insoluble in aqueous solution and NH4NO3 is soluble; therefore, I know a reaction will take place, that Ag2CO3 will be a solid ppt and that NH4NO3 will be present as ions.
The net reaction is as follows:
2Ag^+(aq) + CO3^=)aq) ==> Ag2CO3(s)
I have a site for solutility rules if you need it.
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