Home >
Community >
Titration of sodium carbonate and nitric acid
Upvote
29
Downvote
+ Ph
Posted by
Mark Goodwillie
Titration of sodium carbonate and nitric acid
To solve this problem, you need to know the pKas of carbonic acid.
The pKas are 6.35 and 10.33.
If you add 1 equivalent of acid to $\ce{Na_2CO_{3}}$, the product will be $\ce{NaHCO_{3}}$ (sodium bicarbonate).
In this case, you are going 0.4-.377 = 0.023 moles past the point of 1 equivalent.
I would model the final solution as 0.354 moles of $\ce{HCO_{3}^-}$ and 0.023 moles $\ce{H_2CO_{3}}$ , and use the pKa of 6.35 and the Henderson-Hasselbalch equation to calculate pH.
To solve this problem, you need to know the pKas of carbonic acid.
The pKas are 6.35 and 10.33.
If you add 1 equivalent of acid to $\ce{Na_2CO_{3}}$, the product will be $\ce{NaHCO_{3}}$ (sodium bicarbonate).
In this case, you are going 0.4-.377 = 0.023 moles past the point of 1 equivalent.
I would model the final solution as 0.354 moles of $\ce{HCO_{3}^-}$ and 0.023 moles $\ce{H_2CO_{3}}$ , and use the pKa of 6.35 and the Henderson-Hasselbalch equation to calculate pH.
To solve this problem, you need to know the pKas of carbonic acid.
The pKas are 6.35 and 10.33.
If you add 1 equivalent of acid to $\ce{Na_2CO_{3}}$, the product will be $\ce{NaHCO_{3}}$ (sodium bicarbonate).
In this case, you are going 0.4-.377 = 0.023 moles past the point of 1 equivalent.
I would model the final solution as 0.354 moles of $\ce{HCO_{3}^-}$ and 0.023 moles $\ce{H_2CO_{3}}$ , and use the pKa of 6.35 and the Henderson-Hasselbalch equation to calculate pH.
The proposed answer 10.77 is incorrect.
To solve this problem, you need to know the pKas of carbonic acid.
The pKas are 6.35 and 10.33.
If you add 1 equivalent of acid to $\ce{Na_2CO_{3}}$, the product will be $\ce{NaHCO_{3}}$ (sodium bicarbonate).
In this case, you are going 0.4-.377 = 0.023 moles past the point of 1 equivalent.
I would model the final solution as 0.354 moles of $\ce{HCO_{3}^-}$ and 0.023 moles $\ce{H_2CO_{3}}$ , and use the pKa of 6.35 and the Henderson-Hasselbalch equation to calculate pH.
The proposed answer 10.77 is incorrect.
More
VOTE