Question

Consider the following data on some weak acids and weak bases: acid base К, formula formula name name ethylamine C2HsNH26.4x 10 HСIO 3.0x 10 hypochlorous acid CHN НCN hydrocyanic acid 1.7x 10 4.9 x 1010 pyridine Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' 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 choose one 0.1 м кCN choose one 0.1 м ка 0.1 M CsH5NHBr choose one 0.1 M NaCIO choose one ? X

Answer 1

KCN is conjugate base of HCN

So, its pH would be more than 7

KCl is neutral salt.

So, its pH would be 7

C5H5NHBr is conjugate acid of

So, its pH would be less than 7

NaClO is conjugate base of HClO

So, its pH would be more than 7

KCN is stronger base as compared to NaClO because Ka of HClO is more.

So, pH of KCN will be more than pH of NaClO

Answer:

KCN: 4

KCl: 2

C5H5NHBr: 1

NaClO: 3