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Is carbon dioxide an acid or not?

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Is carbon dioxide an acid or not?

Post  highl on Fri Dec 06, 2013 2:52 am

I keep finding the following claims:
1) Carbonic acid is an acid, so carbon dioxide is an acid since carbon dioxide forms carbonic acid (this ignores that only a small amount of carbon dioxide becomes carbonic acid at normal pressure; most of it still exists in co2 form)
2) Carbon dioxide is a base

I would think there would be a clear answer on something like this but it doesn't seem to be the case. Often claims such as "carbon dioxide dissolves limestone when dissolved in rainwater" are made. Is it the carbon dioxide dissolving the limestone, or is it carbonic acid?

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Re: Is carbon dioxide an acid or not?

Post  JasonGHerbalExt on Mon Jan 05, 2015 4:26 am

Carbon dioxide is acid, because it can bind OH- in the water although the binding is very weak.

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