A buffer solution contains 0.275 M of acetic acid, HC2 H 3 O 2 , and 0.350 M of its conjugate salt, KC 2 H 3 O 2 . i) Write the balanced chemical equation for reaction between the appropriate buffer component ( HC 2 H 3 O 2 or KC 2 H 3 O 2 ) and H 3 O + ions from a strong acid (to show how the buffer works). ii) Calculate the pH after 0.0500 mol of HCl is added to 1.00 L of the buffer solution? K a (HC 2 H 3 O 2 ) = 1.8 × 10 -5
A buffer solution contains 0.275 M of acetic acid, HC2 H 3 O 2 , and 0.350 M of its conjugate salt, KC 2 H 3 O 2 . i) Write the balanced chemical equation for reaction between the appropriate buffer component ( HC 2 H 3 O 2 or KC 2 H 3 O 2 ) and H 3 O + ions from a strong acid (to show how the buffer works). ii) Calculate the pH after 0.0500 mol of HCl is added to 1.00 L of the buffer solution? K a (HC 2 H 3 O 2 ) = 1.8 × 10 -5
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section: Chapter Questions
Problem 89GQ: A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C6H5CO2H, and sodium...
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- A buffer solution contains 0.275 M of acetic acid, HC2 H 3 O 2 , and 0.350 M of its conjugate salt, KC 2 H 3 O 2 .
i) Write the balanced chemical equation for reaction between the appropriate buffer component ( HC 2 H 3 O 2 or KC 2 H 3 O 2 ) and H 3 O + ions from a strong acid (to show how the buffer works).
ii) Calculate the pH after 0.0500 mol of HCl is added to 1.00 L of the buffer solution? K a (HC 2 H 3 O 2 ) = 1.8 × 10 -5
Expert Solution
Step 1
Given : Concentration of HC2H3O2 = 0.275 M
Concentration of KC2H3O2 = 0.350 M
Step 2
i) Since the basic component of the buffer will react with the strong acid.
Hence the H3O+ ions from the strong acid will react with the conjugate base salt as,
=> KC2H3O2 + H3O+ -------> HC2H3O2 + K+ + H2O
Since all the elements are in equal number in both side of the above reaction. Hence the above reaction is already balanced.
ii) Given : Volume of buffer = 1.00 L
Since moles = concentration X volume of solution in L
=> Moles of HC2H3O2 = 0.275 X 1.00 = 0.275 mol
And moles of KC2H3O2 = 0.350 X 1.00 = 0.350 mol
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