H-A Is an Acid with a PKa of 4

question 40

Multiple Choice

H-A is an acid with a pKa of 4.5.Which of the following statements about an aqueous solution of H-A is true?

• A)At pH = 4.5,the solution contains much more H-A than.A^-.
• B)At pH = 4.5,the solution contains much more A^- than H-A.
• C)At pH- 3.5,the solution contains about 90% A^- and 10% H-A.
• D)At pH = 6.5,the solution contains about 80% A^{- and 20% H-A}.
• E)At pH = 5.5,the solution contains about 90% A^- and 10% H-A.

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