The PK_a of a Compound Whose Acidic or Basic Form

question 87

Multiple Choice

The pK_a of a compound whose acidic or basic form absorbs UV or visible light can be determined spectroscopically since

• A)l_max always decreases as acidic form is converted to basic.
• B)the pK_a 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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