Question

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

acid Ka name formula hypochlorous acid HClO ×3.010−8 hydrofluoric acid HF ×6.810−4

base Kb name formula methylamine CH3NH2 ×4.410−4 hydroxylamine HONH2 ×1.110−8

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	Ph
0.1 M KF	?
0.1M HONH3Cl	?
0.1M NaClO	?
0.1 M KNO3	?

Answer 1

Answer:-

The pH of the salt of weak acid and strong base will be greater than 7 and the pH of strong acid and weak base will be less than 7 while the pH of the salt of strong acid and strong base will be 7.

So, 0.1 M KF = 3

0.1 M HONH₃Cl = 1 (lowest pH)

0.1 M NaClO = 4 (highest pH)

0.1 M KNO₃ =2