Homework Help: CHEM HELP!

Posted by Ashley on Tuesday, March 17, 2009 at 6:36pm.

Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in nicotinic acid has a pH of 3.39 at 25*C. What is the acid-ionization constant, Ka and pKa for this acid at 25*C?

CHEM HELP! - DrBob222, Tuesday, March 17, 2009 at 6:56pm
Write the ionization equation.
Prepare an ICE chart.
You know pH and this will give you (H^+), (nicotine ion), and nicotinic acid concn. Plug these into the Ka expression and solve for Ka, then pKa. Post your work if you get stuck.

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