how to write a net ionic equation

[joonkimdds]

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NaF(aq) + Ba(NO3)2 (aq) -->
I change this into Na+ , F- , Ba 2+ , NO3 - -> NaNO3, BaF2
and since NaNO3 is soluble, we get rid of that and say
Ba 2+ + 2F- --> BaF2


But how do I write a net ionic equation for
NH3 (aq) + HCl (aq)
and
BaCO3 (s) + HCl(aq) ?

My initial guess is that I make them into ionic form
Ba2+ , (CO3) 2-, H+, Cl- and then BaCl2 and H2CO3 form but that's not the correct answer.

And how do I know that BaCO3 + HCl is supposed to be a gas forming reaction?

 

[RSD2014]

naf(aq) + ba(no3)2 (aq) -->
i change this into na+ , f- , ba 2+ , no3 - -> nano3, baf2
and since nano3 is soluble, we get rid of that and say
ba 2+ + 2f- --> baf2


but how do i write a net ionic equation for
nh3 (aq) + hcl (aq)
and
baco3 (s) + hcl(aq) ?

My initial guess is that i make them into ionic form
ba2+ , (co3) 2-, h+, cl- and then bacl2 and h2co3 form but that's not the correct answer.

And how do i know that baco3 + hcl is supposed to be a gas forming reaction?

h2co3 ==> h2o + co2(gas)