Question

Consider the following data on some weak acids and weak bases: acid base name formula hydrofluoric acid HF hypochlorous acid HCO 6.8 x 10 3.0 x 10 name formula aniline CH,NH43 x 100 pyridine CHN 1.7* 109 Use this data to rank the following solutions in order of increasing pH. In other words, select all 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 0.1 MKF choose one e 0.1 M NANO choose one 0.1 M CHE NH Br choose one D .1 MC,H,NHỜ choose one B x 5 ?

Answer 1

KF is conjugate base of HF

So, its pH would be more than 7

NaNO3 is neutral salt.

So, its pH would be 7

C6H5NH3Br is conjugate acid of C6H5NH2

So, its pH would be less than 7

C5H5NHCl is conjugate acid of C5H5N

So, its pH would be less than 7

C6H5NH3Br is stronger acid as compared to C5H5NHCl because Kb of C5H5N is more.

So, pH of C6H5NH3Br will be less than pH of C5H5NHCl

Answer:

KF: 4

NaNO3: 3

C6H5NH3Br: 1

C5H5NHCl: 2