Determine the mass of solid NaCH3COO that must be dissolved in an existing 500.0 mL solution of 0.200 M CH3COOH to form a buffer with a pH equal to 5.00. The value of Ka for CH3COOH is 1.8 x 10 5.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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Question 5 of 20
Determine the mass of solid NaCH3CO0 that must be dissolved in an
existing 500.0 mL solution of 0.200 M CH3COOH to form a buffer with a
pH equal to 5.00. The value of Ka for CH;COOH is 1.8 x 10-5
1
3
NEXT >
Let x represent the original concentration of CH3COO" in the water. Based on the given
values, set up the ICE table in order to determine the unknown.
CH;COOH(aq)+
H2O(1)
1,
H3O*(aq)
+ CH;COO (aq)
Initial (M)
Change (M)
Equilibrium (M)
5 RESET
0.200
5.00
-5.00
1.0 x 10-9
-1.0 x 10-9
1.0 x 10-5
-1.0 x 10-5
1.8 x 10-5
-1.8 x 10-5
x +5.00
x -5.00
x + 1.0 x 10-9
x - 1.0 x 10-9
x + 1.0 x 1
x - 1.0 x 10-
x + 1.8 x 10-5
x - 1.8 x 105
2.
Transcribed Image Text:Question 5 of 20 Determine the mass of solid NaCH3CO0 that must be dissolved in an existing 500.0 mL solution of 0.200 M CH3COOH to form a buffer with a pH equal to 5.00. The value of Ka for CH;COOH is 1.8 x 10-5 1 3 NEXT > Let x represent the original concentration of CH3COO" in the water. Based on the given values, set up the ICE table in order to determine the unknown. CH;COOH(aq)+ H2O(1) 1, H3O*(aq) + CH;COO (aq) Initial (M) Change (M) Equilibrium (M) 5 RESET 0.200 5.00 -5.00 1.0 x 10-9 -1.0 x 10-9 1.0 x 10-5 -1.0 x 10-5 1.8 x 10-5 -1.8 x 10-5 x +5.00 x -5.00 x + 1.0 x 10-9 x - 1.0 x 10-9 x + 1.0 x 1 x - 1.0 x 10- x + 1.8 x 10-5 x - 1.8 x 105 2.
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