Question

Consider the following data on some weak acids and weak bases: base acid name к A formula name formula hydrocyanic acid HCN 4.9x 100 hydroxylamine HONH, 1.110 anilline CH, NH, 4.3 X 10-10 hydrofluoric acid HF 6.8x 10 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 0.1 KF choose one 0.1 M HONH, Br choose one 0.1 MCH choose one 0.1 M Nad choose one $ ?

Answer 1

KF is conjugate base of HF

So, its pH would be more than 7

HONH3Br is conjugate acid of HONH2

So, its pH would be less than 7

C6H5NH3Cl is conjugate acid of C6H5NH2

So, its pH would be less than 7

NaCl is neutral salt.

So, its pH would be 7

C6H5NH3Cl is stronger acid as compared to HONH3Br because Kb of HONH2 is more.

So, pH of C6H5NH3Cl will be less than pH of HONH3Br

Answer:

KF: 4

HONH3Br: 2

C6H5NH3Cl: 1

NaCl: 3