Question

Consider the following data on some weak acids and weak bases: acid base Ка К, formula name formula name 10 C5H5N 1.7x 10 hydrocyanic acid HCN 4.9 x 10 pyridine hypochlorous acid HCIO 8 ethylamine C2H,NH2 6.4 x 10 3.0 x 10 Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next the solution that will have the next lowest pH, and so on. solution pH 0.1 M NaCN choose one 0.1 M KCIO choose one 0.1 M CsHsNHC choose one 0.1 M C2HsNH3Br choose one ?

Answer 1

solution	pH
0.1 M NaCN	4
0.1 M KClO	3
0.1 M C5H5NHCl	1
0.1 M C2H5NH3Br	2

Explanation

NaCN is the conjugate base of weak acid HCN and KClO is the conjugate base of weak acid HClO

Since HCN is weaker acid than HClO, therefore, NaCN will be a stronger base than KClO.

Hence, pH of NaCN is higher than pH of KClO.