A laboratory technician wishes to create a buffered solution with a pH of 5. Which of the following acids would be the best choice for the buffer? a. H₂C₂O4 K= 5.9 x 10-2 K= 5.6 x 10-3 b. H3ASO4 c. HC₂H3O2 d. HCIO K= 1.8 x 10-5 K= 3.0 x 10-8

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