Question

ACIDS AND BASES = Predicting the que base properties of salts Consider the following data on some weak acids and weak bases: acid name formula hypochlorous acid HClO hydrofluoric acid HF 3.0 x 10-8 base name formula methylamine CH NH, 4.4 x 10-4 pyridine CHN 1.7* 109 6.8 x 10 4 data to rank the following solutions in order of increasing pH. In other words, select the solution that will have the next lowest pH, and so on. solution pH 0.1 MCH....Br choose one 0.1 M No 0.1 M NaF choose one 0.1 M NaCl choose one 0.1 M CH, NH3C1 choose one x 5 ? Explanation Check

Answer 1

As Ka increases, acidity increases and pH decreases, thus HF is more acidic and pH is less than HClO.

As Kb increases, basicity increases and pH increases. Thus, methyl amine is more basic and pH is higher than pyridine.

So, order is :

Least pH : HF<HClO<C5H5N < CH3NH2 (High pH)