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

Question

Consider the following data on some weak acids and weak bases: acid base name formula name formula aniline lcdi,NH2143×10-10 hypochlorous HIO3010 hydrocyanic acd HCN 4.9x10 acid -10| |methylamine! CH3NH2|4.4×10-4 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 choose one choose one choose one choose one 0.1 M KCIO 0.1 M NaCN 0.1 M KC

Explanation / Answer

C6H5NH3Cl = 0.1 M

pkb of c6h5nh2 = -log(4.3*10^-10) = 9.4

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

   = 7-1/2(9.4+log0.1)

   = 2.8

KClO = 0.1 M

pka of HClO = -log(4.3*10^-8) = 7.4

C = concentration of HClO = 0.1 M

pH = 7+1/2(pka+logC)

   = 7+1/2(7.4+log0.1)

   = 10.2

NaCN = 0.1 M

pka of HCN = -log(4.9*10^-10) = 9.31

C = concentration of HClO = 0.1 M

pH = 7+1/2(pka+logC)

   = 7+1/2(9.31+log0.1)

   = 11.155

KCl - salt of strong acid,base . pH = 7

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