[unsu]

What are the products in the following reactions:

1) KO2 + Na2SO3 + H2SO4 =
2) KO2 + KI + H2SO4 =
3) KO2 + H2S =
4) KO3 + KI + H2SO4 =

And how to make K2CO3 from KCl?
KCl ---> K2CO3 ?

[Borek]

You have to show your attempts at solving the question to receive help. This is a forum policy.

[unsu]

My suggestions:

1) KO2 + Na2SO3 + H2SO4 = K2SO4 + Na2SO4 + H2O (+O2???)
2) KO2 + KI + H2SO4 = K2SO4 + H2O + (KIOx?)
3) KO2 + H2S = K2SO4 + (O2?) + H2O
4) KO3 + KI + H2SO4 = K2SO4 + O2 + KIO4?? + H2O

And how to make K2CO3 from KCl?
KCl ---> K2CO3 ?
I don't know how to do it in one step. Maybe to react it with a salt where carbonate is soluble but chloride is insoluble... Ideas?

[Borek]

First one - oxidation of sulfite to sulfate - looks OK to me.

I am not entirely sure about the rest. Iodide is oxidized first to iodine, whether it gets oxidized further depends on many factors - could be it does, could be it doesn't.

Hydrogen sulfide can be oxidized to elemental sulfur or to sulfate. Again, no idea where the reaction stops (although assuming it goes all the way up to sulfate doesn't look wrong).

I doubt in one step conversion of KCl into K₂CO₃. I am not aware of any cation with insoluble chloride but soluble carbonate.

Perhaps some variant of the Solvay process could work, or converting KCl to KOH. But that's not a single step.

[Zyklonb]

And how to make K2CO3 from KCl?
KCl ---> K2CO3 ?
I don't know how to do it in one step. Maybe to react it with a salt where carbonate is soluble but chloride is insoluble... Ideas?

Took a while, but I found one.
Silver (I) chloride is less soluble (0.0001923 grams/ 100mL at 20°C) vs. Silver carbonate (0.003489 grams/ 100mL at 20°C)
Both are insoluble, (relatively) but the chloride is less soluble, which will drive the equilibrium to the right: KCl + Ag₂CO₃  K₂CO₃ + AgCl.
This of course is a useless reaction (as far as practicality is concerned), but it's always good to think.