Conside following data on some weak acids and weak bases acid base CT name formu

Question

Conside following data on some weak acids and weak bases acid base CT name formula name formula | 3.0 × 10-8 2 4.4x 10 | 1.1 × 10 hypochlorous acid HCIO methylamine CH NH |HCH,CO 211.8×10 -hydroxylamine HONH acetic acid Use this data to rank the following solutions in order of increasing pH. In other words, select a '' 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 NaCH3CO2 choose one 0.1 M CH3NH3Br choose one ' 0.1 M KI choose one 0.1 M KCIo choose one

Explanation / Answer

a)

NaCH3CO2- hydrolysies as

CH3CO2- + H2O <-> CH3CO2H + OH-

this is basic

pH > 7

b)

CH3NH3Br --> CH3NH3+ + Br-

CH3NH3+ hydrolyses as

CH3NH3+ + H2O <-> CH3NH2 + H3O+

pH < 7

c)

KI is neutral, K+ + I- will not ofrm hydrolyis

pH = 7

d)

KClO --> K+ + OCl-

OCl- + H2O <-> HOCl + OH-

this is basic p´H <7

then....oder:

(least pH --> most pH)

CH3NH3Br < KI < NaCH3CO2 < KClO

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