Consider the following data on some weak acids and weak bases acid base name for

Question

Consider the following data on some weak acids and weak bases acid base name formula name formula | 1.1×10 aniline CH^NH2 4.3 x 10 hypochlorous acid | HCIO | 3.0 × 10-0 hydroxylamine HONH 10 hydrocyanic acid | HCN | 4.9 × 10 615* Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' 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 KCIO choose one 0.1 M HONH3Br choose one 0.1 M NaCN choose one 0.1 M Nal choose one

Explanation / Answer

a)pka of HClO = -log(3*10^-8) = 7.52

   pHof KClO = 7+1/2(pka+logC)

   C = 0.1 M , pka= 7.52

pH = 7+1/2(7.52+log0.1) = 10.26

b) pkb of HONH2 = -logKa

                 = -log(1.1*10^-8)

       =7.96

pH of C5H5NHCl = 7 - 1/2(pkb+logC)

       = 7-1/2(7.96+log0.1)

       = 3.52

c) pka of HCN = -log(3*10^-8) = 7.523

   pH = 7+1/2(pka-logC)

      = 7+1/2(7.523 - log0.1)

      = 11.26

d) NaI - salt of strong acid,strong base , pH = 7

answer:       2 = 0.1 M KClO

              4 = 0.1 M HONH3Br

              1 = 0.1 M NaCN

              3   = 0.1 M NaI

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