Chapter 13: Acids And Bases

Chapter 13 Acids and Bases (Dr Chong Fai Kait) 1) A 7.0  103 M aqueous solution of Ca(OH) 2 at 25.0 °C has a pH of __________. A) 12.15 B) 1.85 C) 1.4  102 D) 7.1  1013 E) 11.85

Answer: A

2) The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 108 . At equilibrium, the molarity of H 3 O in a 0.010 M solution of HClO is __________. A) 1.7 105 B) 0.010 C) 5.8 1010 D) 4.76 E) 2.00 3) Using the data in the table, which of the conjugate acids below is the weakest acid?

Answer: A

A) NH 4  B) C5 H5 NH C) H3 NOH 
 D) NH3CH3 E) NH 4  and NH3CH3

Answer: D

4) The K of hypochlorous acid (HClO) is 3.0 108 at 25.0 C . What is the % ionization of hypochlorous acid a in a 0.015M aqueous solution