CW22-MRx - CHM 2046/Myers Worksheet 22 March 1, 2010 1. (a)...

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CHM 2046/Myers Worksheet 22 March 1, 2010 1. (a) When balancing equations, which should be used, H + or H 3 O + ? Anything involving acid/base is best shown using H 3 O + . This emphasizes the reaction is proton transfer, and that every Bronsted acid has a conjugate base. For redox reactions it is customary to use H + . With redox there is no need to show a CB, and balancing these is complicated enough with H + . (b) When balancing equations, which is correct, Mg +2 (aq) or Mg(OH 2 )6 +2 ? Both are correct. We have alternate ways of describing what is just one process: Mg(OH 2 ) 6 +2 + 2 NH 3 . Mg(OH 2 ) 4 (OH) 2 (s) + 2 NH 4 + Mg +2 (aq) + 2 NH 3 + 2 H 2 O . Mg(OH) 2 (s) + 2 NH 4 + Showing the waters of hydration is more descriptive and emphasizes that the precipitation and dissolving of metal hydroxides are proton transfer reactions. Also, it is a little less awkward to not have to insert reactant waters to balance the equation. The equilibrium constant expression, K = [Products]/[Reactants], will be the same
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CW22-MRx - CHM 2046/Myers Worksheet 22 March 1, 2010 1. (a)...

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