Chapter 10 - 10.4(a H2O(l acid1 H2O(l acid1 CN(aq HCN(l...

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10.4 (a) H 2 O(l) + CN - (aq) HCN(l) + OH - (aq) acid 1 base 2 acid 2 base 1 (b) H 2 O(l) + NH 2 NH 2 (aq) NH 2 NH 3 + (aq) + OH - (aq) acid 1 base 2 acid 2 base 1 (c) H 2 O(l) + CO 3 2 - (aq) HCO 3 - (aq) + OH - (aq) acid 1 base 2 acid 2 base 1 (d) H 2 O(l) + HPO 4 2 - (aq) H 2 PO 4 - (aq) + OH - (aq) acid 1 base 2 acid 2 base 1 (e) H 2 O(l) + NH 2 CONH 2 (aq) NH 2 CONH 3 + (aq) + OH - (aq) acid 1 base 2 acid 2 base 1 10.12 (a) as an acid: H 2 PO 4 - (aq) + H 2 O(l) H 3 O + (aq) + HPO 4 2 - (aq) Conjugate acid/base pairs: H 2 PO 4 - (aq) / HPO 4 2 - (aq) H 3 O + (aq) / H 2 O(l) as a base: H 2 PO 4 - (aq) + H 2 O(l) OH - (aq) + H 3 PO 4 (aq) Conjugate acid/base pairs: H 3 PO 4 (aq) / H 2 PO 4 - (aq) H 2 O(l) / OH - (aq) (c) as an acid: HC 2 O 4 - (aq) + H 2 O(l) H 3 O + (aq) + C 2 O 4 2 - (aq) Conjugate acid/base pairs: HC 2 O 4 - (aq) / C 2 O 4 2 - (aq) H 3 O + (aq) / H 2 O(l) as a base: HC 2 O 4 - (aq) + H 2 O(l) OH - (aq) + H 2 C 2 O 4 (aq) conjugate [ m ] % ] conjugate conjugate [ m ] % ] conjugate conjugate [ m ] % ] conjugate conjugate [ m ] % ] conjugate conjugate
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Conjugate acid/base pairs: H 2 C 2 O 4 (aq) / HC 2 O 4 - (aq) H 2 O(l) / OH - (aq) 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
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Unformatted text preview: 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 = ( 29 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 : ( 29 1 2 pH 2.25 6.77 4.51 = + = (b) For Na 2 HAsO 4 the second and third acid dissociation constants must be used: ( 29 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 — change x-— x + x + equilibrium 0.0147 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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  • Spring '08
  • HOEGER
  • conjugate acid/base pairs, ø Rõµ

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