Does sodium bicarbonate solution release CO2 when heated?

[Tohtori huithapeli]

Homework Statement

Solid sodium bicarbonate decompose when it's heated above 50 celsius. However, when it is dissolved in water interactions of components changes. So what happens when sodium hydrogen carbonate solution is heated? Does it release carbon dioxide when temperature is above 50 celsius?

Homework Equations

Decomposition:
NaHCO3(s)-> NaOh(s) + CO2(g)
NaHCO3(s) -> NaCO2 (s) + CO2(g) + H2o (g)
NaHCO3(s) -> Na2O(s) + CO2(g) + H2O (g)

Solution:
NaHCO3(s) + H2O (l) -> Na+ (aq) + HCO3-(aq) + H2O(l)

 

[Borek]

That depends on the partial pressure of CO₂, but in typical conditions solution of bicarbonate will be very slowly loosing the gas even at room temperature.

 

[epenguin]

Yes, I've had a hard time calculating it because of the different values and silly units I find quoted in various places for the water solubility of CO₂, but I think above 1 or 2 mM sodium bicarbonate would lose CO₂. But anyway, you can think about what would happen at that sort of concentration if you started with the solution in equilibrium with the atmospheric CO₂ and then raised the solution temperature.