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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! - ,

    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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