Electrolysis of baking soda solution?

[Artlav]

What is being produced in electrolysis of water with baking soda (NaHCO3) dissolved in it, and carbon electrodes?
Seems to be an extremely simple question, but every place i google up have a different answer.

In practice, there is hydrogen on the cathode - it burns - but on the anode i get some unknown gas.
It does not smell of anything - neither the itchy smell of CO2, nor fresh smell of oxygen, and i can't seem to get any reaction from a lit match.

So, what is happening in there?
Second question - what is happening in the water?
One place i read that it would slowly turn into NaOH solution - would that actually happen?

 

[Borek]

CO₂/O₂ mixture perhaps? When oxygen is produced (which is almost for sure the main reaction) it can oxidize carbon electrodes, plus, one the products of the electrolysis are H⁺ - depending on the concentrations they can acidify solution in the vicinity of the electrode enough to decompose the carbonate.

But I am just guessing. Note that there is probably no one answer to the question - what is really happening can depend on the concentration, applied voltage, properties of the electrode surfaces, mixing and partial pressure of CO₂ in the air above the solution. By no means this is a simple system.