Ammonium chloride solutions are slightly acidic, so they are better solvents tha

Question

Ammonium chloride solutions are slightly acidic, so they are better solvents than water for insoluble substances such as Ca(OH)2. Knowing: Ca(OH)2(s) Ca2+(aq) + 2OH–(aq) Ksp = 4.0 ×10^–8 NH3(aq) + H2O(l) NH4+(aq) + OH–(aq) Kb = 1.8 ×10^–5 Determine Kc for the below overall reaction. Ca(OH)2(s) + 2NH4+(aq) Ca2+(aq) + 2NH3(aq) + 2H2O(l) Ammonium chloride solutions are slightly acidic, so they are better solvents than water for insoluble substances such as Ca(OH)2. Knowing: Ca(OH)2(s) Ca2+(aq) + 2OH–(aq) Ksp = 4.0 ×10^–8 NH3(aq) + H2O(l) NH4+(aq) + OH–(aq) Kb = 1.8 ×10^–5 Determine Kc for the below overall reaction. Ca(OH)2(s) + 2NH4+(aq) Ca2+(aq) + 2NH3(aq) + 2H2O(l) Ammonium chloride solutions are slightly acidic, so they are better solvents than water for insoluble substances such as Ca(OH)2. Knowing: Ca(OH)2(s) Ca2+(aq) + 2OH–(aq) Ksp = 4.0 ×10^–8 NH3(aq) + H2O(l) NH4+(aq) + OH–(aq) Kb = 1.8 ×10^–5 Determine Kc for the below overall reaction. Ca(OH)2(s) + 2NH4+(aq) Ca2+(aq) + 2NH3(aq) + 2H2O(l)

Explanation / Answer

Ca(OH)2 (s) --------------------> Ca+2(aq) + 2OH- (aq) Ksp = 4.0x10-8   eq.1

NH3(aq) + H2O(l) ---------------> NH4+(aq) + OH-(aq) Kb = 1.8x10-5   eq.2

The combined equation

Ca(OH)2 (s) + 2NH4+ ------> Ca+2 (aq) + 2NH3 (aq) + 2H2O(l)

can be obtained by eq. 1 -2x(eq.2)

thus keq. fo 3rd equation is

K3 = K1 x (1/K2)2

= 4.0x10-8 /(1.8x10-5)2

= 1.2345 x102

= 123.45

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