H2CO3(aq) + 2NH3(aq) ====> 2(NH4)^+(aq) + (CO3)^2-(aq)
NOTE: I looked on the web and found answers all over the place so don't trust everything you see on the web. What I have written here is correct.
WRITE IONIC EQUATION OF :
H2CO3(AQ)+2NH3(AQ) ====> (NH4)2CO3(AQ)
2 answers
After I posted the above I did some more digging. Here is an interesting article that I thought you might like to read.
//newscenter.lbl.gov/2014/10/22/new-insights-on-carbonic-acid-in-water/
This article, written by researchers @ UC Berkeley, claim that about 1% of a CO2/H2O mixture forms H2CO3 and in 300 ns that forms H^+ and HCO3^-. No Ka values are given. Also, I found that "anhydrous" H2CO3 can be made and that is stable @ cryogenic temperatures but that doesn't apply to your question since you specifiy H2CO3(aq). Without a Ka value for that ionization to H^+ and HCO3^- I'll stick by my initial answer.
//newscenter.lbl.gov/2014/10/22/new-insights-on-carbonic-acid-in-water/
This article, written by researchers @ UC Berkeley, claim that about 1% of a CO2/H2O mixture forms H2CO3 and in 300 ns that forms H^+ and HCO3^-. No Ka values are given. Also, I found that "anhydrous" H2CO3 can be made and that is stable @ cryogenic temperatures but that doesn't apply to your question since you specifiy H2CO3(aq). Without a Ka value for that ionization to H^+ and HCO3^- I'll stick by my initial answer.