Consider the following data on some weak acids and weak bases:

acid base

Ka name formula Kb name formula

6.8x10-4 hydrofluoric acid HF 1.8x10-5 ammonia NH3

4.9x10-10 hydrocyanic acid HCN 1.7x10-9 pyridine C5H5N

Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on.

solution

a.0.1 M NaCN

b.0.1M NH4Br

c.0.1M KF

d.0.1M KBr