Asked by Debbie
A popular buffer solution consist of carbonate (CO3 2-) and hydrogen carbonate (HCO3-) conjugate acid-base pair. Which, if any of the following such buffers has the highest buffer capacity?
A. 0.9M CO3 2- and 0.1M HCO3-
B. 0.1M CO3 2- and 0.9M HCO3-
C. 0.5M CO3 2- and 0.5M HCO3-
D. 0.1M CO3 2- and 0.1M HCO3-
E. They all have the same buffer capacity.
HOW DO I FIGURE THIS....
A. 0.9M CO3 2- and 0.1M HCO3-
B. 0.1M CO3 2- and 0.9M HCO3-
C. 0.5M CO3 2- and 0.5M HCO3-
D. 0.1M CO3 2- and 0.1M HCO3-
E. They all have the same buffer capacity.
HOW DO I FIGURE THIS....
Answers
Answered by
DrBob222
Do you know what buffer capacity is? It's defined as the mols of strong acid or strong base that can be added to 1 L of a buffer solution and without changing the pH more than +/- 1.
The buffer capacity depends mostly upon two things.
1. The concn of base and acid components.
2. on the RATIO of the base/acid pair.
The maximum buffering capacity is delivered when the RATIO is 1.0. So you want C or D; those are the only ones with ratio of 1.0. Of the two which do you think would provide more capacity? The higher concn, of course.
The buffer capacity depends mostly upon two things.
1. The concn of base and acid components.
2. on the RATIO of the base/acid pair.
The maximum buffering capacity is delivered when the RATIO is 1.0. So you want C or D; those are the only ones with ratio of 1.0. Of the two which do you think would provide more capacity? The higher concn, of course.
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