Consider an unknown base, RNH. One experiment titrates a 50.0-mL aqueous solution containing 2.500 g of the base. This titration requires 59.90 mL of 0.925 M HCl to reach the equivalence point. A second experiment uses a 50.0-mL solution of the unknown base identical to what was used in the first experiment. To this solution is added 29.95 mL of 0.925 M HCl. The pH after the HCl addition is 10.77.
(a) What is the molar mass of the unknown base?
(b) What is Kb for the unknown base?
(c) What is Ka for RNH2+?
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