The pK a of a compound whose acidic or basic form absorbs ultraviolet or visible

ID: 805254 • Letter: T

Question

The pKa of a compound whose acidic or basic form absorbs ultraviolet or visible light can be determined spectroscopically since:

the pKa is the same as the pH at which half of the total absorbance increase occurs

absorbance of the basic form is always twice that of the acidic form

the ?max always decreases as the acidic form is converted to the basic form

absorbance of the acidic form is always twice that of the basic form

resonance delocalization always leads to a decrease in pKa

the pKa is the same as the pH at which half of the total absorbance increase occurs

absorbance of the basic form is always twice that of the acidic form

the ?max always decreases as the acidic form is converted to the basic form

absorbance of the acidic form is always twice that of the basic form

resonance delocalization always leads to a decrease in pKa

the pKa is the same as the pH at which half of the total absorbance increase occurs

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