Pyridinium bromide (C5H5NHBr) is a strong electrolyte that dissociates completely into C5H5NH+ and Br− . An aqueous solution of pyridinium bromide has a pH of 2.94.
a) Write out the reaction that leads to this acidic pH .
b) Using the Kb for pyridine, 1.7×10−9 , calculate the Ka for pyridinium bromide.
c) A solution of pyridinium bromide has a pH of 2.94. What is the concentration of the pyridinium cation at equilibrium, in units of molarity?