Asked by Rick
An aqueous solution contains 0.223 M carbonic acid and 0.112 M hydrobromic acid.
Calculate the carbonate ion concentration in this solution.
[CO32-] = mol/L.
Can you please help me how to solve this problem?
Calculate the carbonate ion concentration in this solution.
[CO32-] = mol/L.
Can you please help me how to solve this problem?
Answers
Answered by
DrBob222
There are two ways to do this, a long way and a short way.
The short way is to combine the k1 and k2 for carbonic acid this way.
H2CO3 --> 2H^+ + CO3^2-
k1k2 = (H^+)^2(CO3^2-)/(H2CO3)
You have H2CO3, and H^+ (from the HBr), substitute and solve for CO3^2-
(Note: The ionization equation I wrote actually doesn't happen that way; however, that's the way it end up and it never knows we took a shortcut. The other point I want to make is that you may use this shortcut ONLY when you are given H^+ and H2CO3 and you CO3^2- OR you are given CO3^2- and H2CO3 and you want to find H^+. It will not work for a given of H2CO3 and you want to find H^+ and/or HCO3^-.)
The short way is to combine the k1 and k2 for carbonic acid this way.
H2CO3 --> 2H^+ + CO3^2-
k1k2 = (H^+)^2(CO3^2-)/(H2CO3)
You have H2CO3, and H^+ (from the HBr), substitute and solve for CO3^2-
(Note: The ionization equation I wrote actually doesn't happen that way; however, that's the way it end up and it never knows we took a shortcut. The other point I want to make is that you may use this shortcut ONLY when you are given H^+ and H2CO3 and you CO3^2- OR you are given CO3^2- and H2CO3 and you want to find H^+. It will not work for a given of H2CO3 and you want to find H^+ and/or HCO3^-.)
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.