The PKa of a Compound Whose Acidic or Basic Form

question 38

Multiple Choice

The pKa of a compound whose acidic or basic form absorbs UV or visible light can be determined spectroscopically because ________.

• A) λ_max always decreases as the acidic form is converted to the basic form
• B) the pKa is the same as the pH at which half of the total absorbance increase occurs
• C) absorbance of the basic form is always twice that of the acidic form
• D) absorbance of the acidic form is always twice that of the basic form
• E) delocalization always leads to a decrease in acidity

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