Niacin one of the B vitamin has the molecular formula C6H5NO2. Niacin is mostly indicated as HN. A 0.020M solution of niacin has a pH of 3.26. What is the percentage of the acid is ionized in this solution?

Chemistry: The Molecular Science
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Chapter14: Acids And Bases
Section: Chapter Questions
Problem 131QRT: At 25 C, a 0.10% aqueous solution of adipic acid, C5H9O2COOH, has a pH of 3.2. A saturated solution...
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 Niacin one of the B vitamin has the molecular formula C6H5NO2. Niacin is mostly indicated
as HN. A 0.020M solution of niacin has a pH of 3.26. What is the percentage of the acid is
ionized in this solution? 

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