Wksht11 - CHM 2046/Myers 2010 Class Worksheet 11 February 1...

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CHM 2046/Myers Class Worksheet 11 February 1, 2010 1. Give the net ionic equation for the principal (large shift right) reaction occurring when these are mixed. NAR = no appreciable reaction is a possible answer. (a) NaH 2 PO 4 (aq) and NH 4 Ac(aq) (c) NaH 2 PO 4 (aq) and NaHSO 4 (aq) (b) NaH 2 PO 4 (aq) and NaOH(aq) (excess) (d) NaH 2 PO 4 (aq) and NH 3 (aq) (excess) 2. The Common Ion Effect. A solution is both 0.10 M HAc and 0.050 M NaAc. The principal species present are: [HAc] = 0.10 M and [Na + ] = [Ac - ] = 0.050 M Calculate [H 3 O + ] and the solution pH. HAc(aq) + H 2 O( l ) H 3 O + (aq) + Ac - (aq), Ka = 1.8 x 10 -5 [H 3 O + ] = ______________ pH = ________________ Recall that for 0.10 M HAc only, [H 3 O + ] = 1.3 x 10 -3 M and pH = 2.87. The [H 3 O + ] has been reduced by the addition of Ac-. This “shift” is called the common ion effect . 3. Oxides as Acids and Bases. (a) Metal oxides hydrate to basic hydroxides: (b) Nonmetal oxides hydrate to acidic hydroxides:
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4. Molecular Structure and Understanding Strengths of Acids (text Section 18.6) . Recall that oxyacids are actually hydroxide acids (Worksheet 10): H 2 SO 4 is O 2 S(OH) 2 It is important to visualize the actual molecular structures in order to answer such
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