Sodium Carbonate (-1) ions?

Hello,

I'm using an equilibrium chemistry software package to try and model
what species will be present at equilibrium when solid sodium
carbonate and sodium bicarbonate are added to aqueous solution with a
high pH (~14, by previously adding sodium hydroxide). Apart from
seeing the the types of precipitates expected (hydrates of carbonates,
bicarbonates and mixed salts) it usually also predicts large
quantities of sodium carbonate ions. I'm surprised by this as I
didn't know that there was such a stable ion. The solutions are very
concentrated - for example 3 mol of solid sodium bicarbonate plus 3
mol of sodium carbonate plus 5 mol of sodium hydroxide, results in 1
mol of sodium carbonate (-) ions at equilibrium.

My question is: is there really such a stable species as NaCO3(-), or
is this some artifact of the packages calculations? It is not an ion
I've seen mentioned elsewhere (in textbooks, or journal articles). The
product is OLI (www.olisystems.com).

Thanks,
Neil
.

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