Acid/Base
The following are sample non multiple choice questions taken from recent exams: These particular questions cover: 
        • Conjugate acid/base pairs and solution acidity.
        • pH and pOH calculations
        • Salt solutions and pH
        • Weak acid/base and strong acid/base.

1.A 0.50 M solution of nitrous acid (HNO2) has an approximate pH of:

2.The pH of a 0.05 M barium hydroxide solution is ________________ . 
Show your work

3.Write a balanced chemical equation to show that sodium cyanide (NaCN) is basic in water solution.

4.Kb for the  reaction in question 3 is?