Question 1
The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × 10
-8. At equilibrium, the molarity of H
3O
+ in a 0.010 mol L
-1 aqueous solution of HClO is:
◦ 1.7 × 10
-5◦ 0.010
◦ 5.8 × 10
-10◦ 4.76
◦ 2.00
Question 2
The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0 °C is 4.9 × 10
-10. What is the pH of an aqueous solution of 0.080 mol L
-1 sodium cyanide (NaCN)?
◦ 11.11
◦ 2.89
◦ 1.3 × 10
-3◦ 7.8 × 10
-12◦ 3.9 × 10
-11