Question

ACIDS AND BASES Predicting the qualitative acid-base properties of salts Consider the following data on some weak acids and weak bases: base K acid K name formula acetic acid HCH,CO, 1.8 X 105 name formula aniline CH3NH2 4.3x10-10 pyridine CHN 1.7x10-9 hydrofluoric acid HF 6.8*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 MC,H, NHB choose one 0.1 MC,H, NH 0.1 MKCH.COM DINN choose one!

Answer 1

C5H5NHBr is conjugate acid of C5H5N

So, its pH would be less than 7

C6H5NH3Cl is conjugate acid of C6H5NH2

So, its pH would be less than 7

KCH3CO2 is conjugate base of CH3CO2H

So, its pH would be more than 7

NaF is conjugate base of HF

So, its pH would be more than 7

C6H5NH3Cl is stronger acid as compared to C6H5NH3Cl because Kb of C5H5N is more.

So, pH of C6H5NH3Cl will be less than pH of C5H5NHBr

KCH3CO2 is stronger base as compared to NaF because Ka of HF is more.

So, pH of KCH3CO2 will be more than pH of NaF

Answer:

C5H5NHBr: 2

C6H5NH3Cl: 1

KCH3CO2: 4

NaF: 3