. Determine the pH of an HCN/KCN buffer containing 0.10 mol HCN and o.070 mol KCN before and after the addition of 0.0010 mol HCI to 1.0 L of buffer. (Ka = 4.79 x 10-10) (before: 9.16 after: 9.15) %3D
. Determine the pH of an HCN/KCN buffer containing 0.10 mol HCN and o.070 mol KCN before and after the addition of 0.0010 mol HCI to 1.0 L of buffer. (Ka = 4.79 x 10-10) (before: 9.16 after: 9.15) %3D
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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:4. Determine the pH of an HCN/KCN buffer containing 0.10 mol HCN and o.070 mol KCN
before and after the addition of 0.0010 mol HCl to 1.0 L of buffer.
(Ka = 4.79 x 10-10) (before: 9.16 after: 9.15)
%3D
5. If 25 mL of 0.20 M NAOH(ag) is added to 50.0 mL of 0.10 M CH3COOH(a)
(Ka = 1.8 x 10-5), what is the pH? (pH = 8.78)
%3D
!3!
6. Calculate the mass of (NHA)2SO4ts) that must be added to 1.00 L of 0.50 M NH3(ag) in order
to prepare a buffer with a pH of 8.65. (Ka for NH*=5.6 x 10-10) (130 g)
7. Calculate the pH of the solution prepared when 0.250 mol of HCIO, is added to 2.0 L of a
solution containing 0.500 M CH;COOH(a) and 0.400 M CH3COONA(ag)-
(Ka for CH,COOH = 1.8 x 10-5) (pH = 4.39)
%3D
8. A buffer is prepared in which the ratio of HCO,/CO,? is 5.00.
a) What is the pH of this buffer? (Ka for HCO = 4.80 x 10-11) (pH = 9.62)
b) Enough strong acid is added to make the pH of the buffer 9.30. What is the ratio of
HCO, /CO, at this point? (HCO,/Co, 1.0 X 10)
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