A Certain Carboxylic Acid Has a K_a of 5

question 111

Multiple Choice

A certain carboxylic acid has a K_a of 5.1 × 10^-7. What is the ratio of the ratio of the deprotonated to the protonated form, respectively, at physiological pH of about 7.4? Assume the following general reaction. HA(aq) + H₂O(l) → H₃O⁺(aq) + A^-(aq)

• A) 13 : 1
• B) 1 :13
• C) 100 : 1
• D) 1 : 100

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