The PK_a of a Certain Weak Acid Is 4

question 62

Multiple Choice

The pK_a of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

• A) 1000:1
• B) 20:1
• C) 3:1
• D) 1:1
• E) The ratio cannot be calculated without knowing the structure of the weak acid.

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