Question

.ollowing data on some weak acids and weak bases Consider acid base К, Ка formula formula name name 10 4.9 x 10 methylamine CH3NH2 4.4 x 10 hydrocyanic acid НCN C6H5NH24.3 x 10- 10 -8 3.0 x 10 HCIO hypochlorous acid aniline 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 0.1 M NaI choose one 0.1 M CH3NH3 Br choose one 0.1 M NaCIO choose one 0.1 М КCN choose one

Answer 1

* We know -hat Acids have low p" valuas H Bases have ma pH Values (7 to 14) By Com paringka Values Can-detemine Ne Whica ohe H has måe 4 les p Values. P CH2NH2 kb = 4 .4 X10 kax kb 14 K a 4-4-04 971 ka = 2-23 x/ 4 9 x10 H CN Ka = 3 x 8 ka 3 2x 10 CH dan ka Values increeing 8den 3-27101 (H) N entent 4 Hlo < HCN nalure Aridic ka 4 The &trngest Arid and itys Very wak So, Canjugate Base --Bas is Ka pti ddends dierent salt sotutions p alues 1 GIM NaT -> OIM CHNHk0v> 2 Nauio ranking P 4. OIM KCN 3