Ionization of Acids and Bases — MCQ Practice

A 0.01 M solution of a weak acid HA has a pH of 4.0. What is the acid ionization constant ($K_a$) for HA?

Which of the following statements is INCORRECT regarding the ionization of weak acids?

Calculate the pH of a 0.005 M solution of $Ba(OH)_2$.

A weak acid HA has a $K_a = 4.0 \times 10^{-6}$. What is the degree of ionization ($alpha$) in a 0.04 M solution of HA?

Which of the following conjugate bases is the strongest?

A 0.1 M solution of ammonia ($NH_3$) has a pH of 11.12. What is the $K_b$ for ammonia? ($log 7.94 = 0.90$)