Thermal decomposition of KHCO3 to KOH ?

[piateczka]

Hi,

Does anyone know if it is possible to thermally decompose KHCO3 to KOH; perhaps it is possible but some specific conditions are required.

I know that KHCO3 decomposes into K2CO3, H2O and CO2 but the question is if it could decompose to KOH?

Thanks!

 

[25362]

I hope this helps:

From a chemistry book on amphoteric equilibria:

A 0.1 M HCO₃^- water solution results in pH = 8.3 [≈] [½] (pK₁ + pK₂)

since [H₃O⁺] [≈] (K₁K₂)^[½]

K₁ = 2.3 [×] E-8
K₂ = 4.8 [×] E-11