Hydrogen What Is
What molecule forms the Hydrogen carbonate ion?
Hey. Can anyone explain how the Hydrogen carbonate ion is formed? Seeing as its structure is that of a molecule, I’m assuming that a molecule gained an electron from somewhere to form a negatively charged ion? Please help! I just really need to know how the ion is created.
Hydrogen carbonate or bicarbonate ion is formed when CO2 reacts with water. Actually, not very many of them are formed, but enough to make the resulting solution mildly acidic.
CO2(aq) + H2O <==> H+ + HCO3^-
This equilibrium lies to the left, meaning that most of the CO2 dissolved in water stays CO2 and very little goes to form the bicarbonate. This is the equilibrium that exists when we have a solution of “carbonic acid”. There are actually no molecules of H2CO3 present in aqueous solution.
There are many other reactions which can present cases where carbonate ions CO2^2- can combine with H+ to make HCO3-
You mention that it might be formed when a molecule gains an electron. No. There is no neutral HCO3 molecule that gains an electron. The HCO3- ion forms when CO2 reacts with water.
============== Follow up ==============
With respect to Nikita, if she got this from a book … “H + ions and CO – ions…when they combine they form HCo3 wich is an week acid…” then it is not a very good chemistry book.
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