You probably have a mix of gallium oxides, hydroxides, and chlorides, if aluminum's behavior is any indication. You also can't rule out the
possibility of the complex itself being soluble at low pH. Also, how do you plan to remove the ammonia, even if the complex breaks down at low pH?
It'd just form again if you raised the pH in an attempt to remove the ammonia.
NaOH will form galliate salts, however sodium carbonate should precipitate oxides and/or hydroxides, if that's what you want. Gallium carbonate (like
aluminum) won't form in aqueous solutions. |