[MitchTwitchita]

I have some really nasty chemical formulas that I'm having a hard time dealing with.  Can anybody help me?  Please.

Na2CO3(aq) + NaOH(aq) >
Na2SO3 (aq) + NaOH(aq) >
(NH4)2Fe(SO4)2(aq) + K3[Fe(CN)6](aq) >
Fe(NO3)3(aq) + K3[Fe(CN)6](aq) >
Fe(III)(s) + HCl(aq) + K3[Fe(CN)6] >

I'm thinking that the sodium cations of the first two would just exchange places.  However, I can't help but wonder if a gas is produced in those reactions.  As for the other three, I'm completely stumped, so any help would be beneficial.  Thanks.

[AWK]

Na2CO3(aq) + NaOH(aq) >
Na2SO3 (aq) + NaOH(aq) >

Nothing changes
For the rest, start from:
http://en.wikipedia.org/wiki/Prussian_blue

[Borek]

I'm thinking that the sodium cations of the first two would just exchange places.

Are they different? Could you tell which one was from which compound?