Bubbling NH3 into GAA sounds a bit complicated. I'd think it'd be easier to neutralize something like ammonium hydroxide ('household ammonia') with GAA,
NH4OH + HOAc __> NH4OAc + H2O.
Actually, ammonium carbonate (which my pharmacist sells for some reason) would be better cos then you should be able to judge the neutralizzzzzation point when the stuff stops fizzing (also volumetrically more efficient),
(NH4)2 CO3+ 2HOAc __> 2NH4OAc + H2O + CO2.
Oh, just checked: "Ammonium carbonate" is usually a mixture of carbonate, bicarbonate, sesquicarbonate & carbamate. Should still produce the acetate though.
All the above should apply in analogous fashion for sodium acetate btw.
Beware of posts that use the word 'should' a lot.
mmm...all this stuff is probably in TFSE...
ah I'll post it anyway..