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CW25-Ind - CHM 2046/Myers Worksheet 25 1 Review NIE for...

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CHM 2046/Myers Worksheet 25 March 17, 2010 1. Review NIE for some solubility/acid-base reactions. (None are redox.) (a) CaO(s) dissolves in NH 4 + (aq) (b) Al 2 O 3 dissolves in HCl(aq) (c) Al 2 O 3 dissolves in NaOH(aq) (d) CaSO 4 (s) dissolves in 6 M HCl 2. A Voltaic Cell with No Salt Bridge (!!) (a) Indicate the ½ reactions and the overall equation for the spontaneous cell reaction. (b) Find the E°cell. (c) Indicate the signs of the electrodes, The direction of motion of the ions and e - as the cell discharges. Indicate which are the cathode and anode . (d) How and why can this work ?? (e) calculate the cell E if the solution is 0.010 M ZnCl2. 3. A spontaneous redox reaction can be run either of two ways: Built into a voltaic cell, producing electrical energy, or Just run directly, producing heat. For class Friday, bring your E° chart.
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3. Industrial/Consumer Chemistry based on CaCO 3 CaCO 3 = limestone or lime rock (over which much of Florida sits) CaO = lime or quick lime Ca(OH) 2 = slaked lime Na 2 CO 3 = soda ash Na 2 CO 3 10H 2 O =
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