Using the ICE table method, determine the pH of a solution containing 0.42 M C₂H₅NH₂ and 0.64 M C₂H₅NH₃Br (K_b C₂H₅NH₂ = 5.6×10^–4).

Propionic acid (C₂H₅COOH) has a pK_a of 4.886. What is the pH of a 0.065 M sodium propionate solution?

Piperidine is essential in drug production. It is a weak organic base. 

 What is the K_b for piperidine if 0.067 M solution of piperidine has a pH of 11.94?

For a 2.50 M NaClO solution, what would be the concentration of the species present at equilibrium?

What is the K_b for a 0.200 M solution of CH₃NH₂ with a pH of 11.961?

Determine the pH of 150.0 mL of 0.40 M pyridine (C₅H₄N) solution. What is the pH after addition of 5.0 g pyridinium hydrochloride (C₅H₄NHCl)? Assume the addition of pyridinium hydrochloride does not affect the volume.