Question

Consider the following data on some weak acids and weak bases

acid		Ka
name	formula
acetic acid	HCH3CO2	1.8 x10−5
hydrocyanic acid	HCN	4.9 x 10−10

base		Kb
name	formula
pyridine	C5H5N	1.7 x 10−9
ammonia	NH3	1.8 x 10−5

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.

0.1M NaCH3CO2

0.1M NH4Br

0.1M NaBr

0.1M KCN