Re: bicarb of soda and carbonic acid
- From: "Ron Jones" <ron@xxxxxxxxxxxxxxx>
- Date: Tue, 20 Dec 2005 19:39:18 -0000
Marshall Dudley wrote:
> onehappymadman@xxxxxxxxx wrote:
>
>> Marshall Dudley wrote:
>>> Adding a very small amount of baking soda to carbonic acid is very
>>> interesting to analyze.
>>>
>>> NaHCO3 + H2CO3 -> NaOH + 2CO2 + H2O
>>
>> Are you sure about this reaction? Did you make this one up? H2CO3
>> is supposed to be mildly acidic. It's CO2 in water. Adding a weak
>> base to it doesn't sound like it should form a strong base.
>
> I agree, but if you add a base to an acid it should react though,
> right? Or is it possible to have an acid and a base together without
> any reaction at all. Or is there a rection, but I completely missed
> the formulea? I am not sure, but then that is why I am asking.
>
Ah, I think you've missed the point here. NaHCO3 may be weakly alkaline, but
it's an "acid salt" - i.e the product of only half neutralizing a dibasic
acid with a base. cf. NaHSO4. It's just that H2CO3 is *so* weak, that the
reversible reaction in water, yields enough basic material to give a pH of
8.
Therefore in your reaction you are adding an acid salt to an acid = no
reaction.
--
--
Ron Jones
Don't repeat history, see unreported near misses in chemical lab/plant
at http://www.crhf.org.uk
Only two things are certain: The universe and human stupidity; and I'm
not certain about the universe. ~ Albert Einstein
.
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