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The AIDS drug zalcitabine (also known as ddC) is a weak base with the structure shown...

The AIDS drug zalcitabine (also known as ddC) is a weak base with the structure shown below and a pKb of 9.8.

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What percentage of the base is protonated in an aqueous zalcitabine solution containing 555 mg/L ?

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The AIDS drug zalcitabine (also known as ddC) is a weak base with the structure shown...
The AIDS drug zalcitabine (also known as ddC) is a weak base with the structure shown below and a pKb of 9.8. What percentage of the base is protonated in an aqueous zalcitabine solution containing 565 mg/L ?    (Answer to 2 significant figures)
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