HA Is an Acid with a PK_a=4

question 6

Multiple Choice

HA is an acid with a pK_a=4.5 hich of the following statements about an aqueous solution of HA is true?

• A) At pH=4.5 , the solution contains more H-A than A-
• B) At pH=4.5 , the solution contains more A- than H-A.
• C) At pH=3.5 , the solution contains more A- and HA.
• D) At pH=6.5 , the solution contains much more HA than A-.
• E) At pH=4.5 , the solution contains about the same amount of A- and HA.

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