Since PK_a = -Log K_a, Which of the Following Is

question 15

Multiple Choice

Since pK_a = -log K_a, which of the following is a correct statement?

• A)acetic acid (pK_a = 4.7)is stronger than lactic acid, (pK_a = 3.9)
• B)lactic acid, (pK_a = 3.9)is weaker than all forms of phosphoric acid, (pK_a = 2.1, 6.9 and 12.4)
• C)since the pK_a for conversion of the ammonium ion to ammonia is 9.25, ammonia is a weaker base then the acetate ion
• D)for carbonic acid with pK_a values of 6.3 and 10.3, the bicarbonate ion is a stronger base than the carbonate ion
• E)none of the above

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