Chapter%2010-112%2c%20120%2c%20134

Chapter%2010-112%2c%20120%2c%20134 - be used: ( ) 1 2 pH...

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295 10.112 (d) best describes the concentration of the solution. Because H 2 SO 4 is a diprotic acid and first dissociation is complete in an 0.10 M H 2 SO 4 solution. The [H + ] should be > 0.10 M due to the second dissociation from HSO 4 - . However, [HSO 4 - ] < 0.10 M because some of HSO 4 - ions will be further dissociated into SO 4 2- . 10.120 (a) The pH is given by pH = ( ) 1 a1 a2 2 p p + K K . The first and second dissociations of H 3 AsO 4 are the pertinent values for NaH 2 AsO 4 : ( ) 1 2 pH 2.25 6.77 4.51 = + = (b) For Na 2 HAsO 4 the second and third acid dissociation constants must
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Unformatted text preview: be used: ( ) 1 2 pH 6.77 11.60 9.19 = + = 10.134 -+ 3 2 2 3 2 3 CH CH COOH(aq) H O(1) CH CH COO (aq) H O (aq) + + Concentration 1 (mol L ) initial 0.0147 0 0 change x x + x + equilibrium0.0147 x x x + 2 2 5 3 2 3 a 3 2 [CH CH COO ][H O ] 1.3 10 [CH CH COOH] 0.0147 0.0147 x x K x = = = 4 4 4.4 10 4.4 10 , Percent deprotonated 100% 3.0% 0.0147 x = = =...
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