H-A Is an Acid with a PKa of 4

question 1

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 soluton 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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