can cal. carbonate go back to bicarb

[dan223]

Just wondering if baked baking soda can turn back into bicarbonate by being exposed to air and moisture?

[Randy Holmes-Farley]

Very slowly it goes to something in between sodium carbonate and sodium bicarbonate. In general, I wouldn't worry about it aside from keeping it closed. :)

[dan223]

Thanks, Do you have a simplified explaination of how it occurs?

[Randy Holmes-Farley]

Simplified all the way:

CO2 and water reenter the solid to some extent, reversing the process that happened when you heated it to drive them off.

Is that what you meant? I would not worry about it happening in a closed container. :)