You Have Been Asked to Determine the PK_a of an Unknown

question 1

Multiple Choice

You have been asked to determine the pK_a of an unknown acid. In a solution at pH 7.0, you find that 24% of the acid is in its deprotonated form. What is the pK_a of the acid?

• A)7.9
• B)7.5
• C)6.5
• D)5.6
• E)none of the above

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Definitions:

Synthetic Steps

The individual and successive chemical reactions conducted to synthesize a desired compound, forming a part of an overall synthetic strategy.

Transformation

The alteration of a chemical compound into another compound through a chemical reaction.

Chromic Acid Test

A qualitative test used to distinguish primary and secondary alcohols by their oxidation to carboxylic acids or ketones, respectively.

Alcohols

Organic compounds featuring one or more hydroxyl (-OH) groups attached to a carbon atom.