Ammonium chloride solutions are slightly acidic, so they are better solvents than water for insoluble substances such as Ca(OH)2. Identify two reactions that, added together, give the overall reaction below, and determine Kc for the overall reaction.
Ca(OH)2(s)+ 2NH4+(aq) 
Ca2+(aq)+ 2NH3(aq)+ 2H2O
Given: Ksp for Ca(OH)2 is 4.0 * 10-8; Kb for NH3 is 1.8 * 10-5.
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