Soft drinks such as Coca Cola and Pepsi are acidic due to the presence of dissolved carbon dioxide that forms carbonic acid. Assume none of the carbonic acid exists as dissolved carbon dioxide. The dissociation of carbonic acid is: H;COs(aq) =HCO3 (aq) + H*(aq) For the problem, assume that the bicarbonate ion, HCO3', does not dissociate again to form the carbonate ion. In order to determine the acidity of a 355 mL can of soda, 0.500 M NaOH is titrated in, taking 25.78 mL to fully neutralize the carbonic acid. This leads to the result that there was 0.0129 mol H2CO3 in the can, with an initial pH of 2.32. (a) After the titration, what major species are present in the solution, and which will dominate the pH? (b) Which of the following acid-base equilibrium reactions determines the pH after the titration? I. H2CO3(aq) =HCO3 (aq) + H*(aq) Ka = 2.51×104 %3D II. HCO3'(aq) + Hz0(1) = H2CO3(aq) + OH'(aq) %3D (c) What is the pH of the solution after the titration?
Soft drinks such as Coca Cola and Pepsi are acidic due to the presence of dissolved carbon dioxide that forms carbonic acid. Assume none of the carbonic acid exists as dissolved carbon dioxide. The dissociation of carbonic acid is: H;COs(aq) =HCO3 (aq) + H*(aq) For the problem, assume that the bicarbonate ion, HCO3', does not dissociate again to form the carbonate ion. In order to determine the acidity of a 355 mL can of soda, 0.500 M NaOH is titrated in, taking 25.78 mL to fully neutralize the carbonic acid. This leads to the result that there was 0.0129 mol H2CO3 in the can, with an initial pH of 2.32. (a) After the titration, what major species are present in the solution, and which will dominate the pH? (b) Which of the following acid-base equilibrium reactions determines the pH after the titration? I. H2CO3(aq) =HCO3 (aq) + H*(aq) Ka = 2.51×104 %3D II. HCO3'(aq) + Hz0(1) = H2CO3(aq) + OH'(aq) %3D (c) What is the pH of the solution after the titration?
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Soft drinks such as Coca Cola and Pepsi are acidic due to the presence of dissolved carbon
dioxide that forms carbonic acid. Assume none of the carbonic acid exists as dissolved carbon
dioxide. The dissociation of carbonic acid is:
H2CO3(aq) =HCO;(aq) + H*(aq)
For the problem, assume that the bicarbonate ion, HCO3', does not dissociate again to form the
carbonate ion. In order to determine the acidity of a 355 mL can of soda, 0.500 M NaOH is
titrated in, taking 25.78 mL to fully neutralize the carbonic acid. This leads to the result that there
was 0.0129 mol H2CO3 in the can, with an initial pH of 2.32.
(a) After the titration, what major species are present in the solution, and which will dominate the
pH?
(b) Which of the following acid-base equilibrium reactions determines the pH after the titration?
I. H;CO3(aq) =HCO3 (aq) + H*(aq) Ka = 2.51×104
II. HCO3 (aq) + H2O(1) = H2CO3(aq) + OH'(aq)
Кь 3D 3.98х1011
(c) What is the pH of the solution after the titration?
(d) Briefly explain how one would calculate (determine) the actual amount of carbonic acid
present in solution from the CO2 present in the closed can.
Expert Solution
Step 1
Since you have posted question with multiple sub-parts, we are entitled to answer the first 3 only.
Given: Moles of H2CO3 in the can = 0.0129 mol.
Volume of soda can used = 355 mL = 0.355 L
Volume of NaOH solution used = 25.78 mL = 0.02578 L
And HCO3- does not dissociate further to produce CO32-.
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