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Topic: Dissociation of sodium carbonate in water  (Read 22354 times)

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Offline dt5sphd

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Dissociation of sodium carbonate in water
« on: December 12, 2009, 10:50:10 AM »
I know this might sound silly, but could anyone complete this reaction:
Na2CO3 + H2O  :rarrow: ?
For some reason i don't want to believe that its NaOH + H2CO3
Also, would i get HCO3- ions or OH- ions here ?
Thank you.
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Offline sjb

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Re: Dissociation of sodium carbonate in water
« Reply #1 on: December 12, 2009, 01:57:42 PM »
HCO3- (sic) seems really unlikely, can you draw a structure, look at valence electrons etc? If you mean HCO3- look at the bicarbonate ion, and into Ka's etc to see the extent of the reaction
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Offline dt5sphd

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Re: Dissociation of sodium carbonate in water
« Reply #2 on: December 12, 2009, 03:45:22 PM »
Sorry i did mean HCO3- not HCO3-. What do you mean by "look into Ka's etc" ?
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Offline savy2020

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Re: Dissociation of sodium carbonate in water
« Reply #3 on: December 13, 2009, 10:05:00 AM »
Since sodium carbonate is a salt of a weak and strong base, the anion undergoes hydrolysis{reaction with water}.
So HCO3- and OH- are formed when a proton transfer occurs from H2O to CO32-.
Also again HCO3- undergoes hydrolysis accepting proton from water forming H2CO3 and OH-
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:-) SKS
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