Could someone please check my work????

Question

could someone please check my work? Thank you. Note(some of these reactions may be reversible but I'm not sure if I have them right)

1. carbon dioxide gas is bubbled through a solution of lithium hydroxide.
CO2(g)+2LiOH(aq) ===> Li2CO3(aq)+ HOH(l)

2. Sodium nitrite is reacted with hydrochloric acid
NaNo2(aq)+HCl(aq) ===>NaCl(aq)+HNO2(aq)
(not reveresible, I think? right?)

3. carbon dioxide gas is reacted with solid potassium oxide
CO2(g)+K2O(s)===>K2CO3(?)

4. ammonium carbonate+potassium bromide
(NH4)2CO3(aq)+KBr(aq) <====> NH4Br(aq)+ K2CO3(aq)
(this should be reversible right?)

5. oxalic acid(.1M)reacts with an equal volume of cesium hydroxide(.1M)
H2C2O4(aq)+CsOH(aq)===>CsHC2O4(aq)+HOH(l)
(I read this one somewhere and think this is right but why is molarity important)

thank you for your help

Answer 1

1. Correct. The reaction is driven to the right by the formation of H2O, which is hardly at all ionized, thus taking OH- ions out of solution.
2. Correct. Same reason. HNO2 is a weak acid, only slightly ionized.
3. Correct.
4. No reaction. This is because NH4+, CO3=, K+, and Br- do not combine to form any gas or nonionized product.
5. Correct. Molarity is important, because if you react with more CsOH, then CsHC2O4(aq) + CsOH(aq) ===> Cs2C2O4(aq) + H2O.