Determine the minimum concentration of KOH Potassium hydroxide is used to precip

Question

Determine the minimum concentration of KOH Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KOH required for precipitation to begin in 2.8*10^-3 M Fe(NO3)2?

Explanation / Answer

a) CaCl2 + 2KOH --> Ca(OH)2 + 2KCl Ca(OH)2 Ca^2+ + 2OH^- ksp = 1.5*10^-2 + x^2 4.68*10^-6 = 1.5*10^-2 + x^2 x= [KOH] = 0.01766 b) Fe(NO3)2 +2 KOH--> Fe(OH)2 + 2KNO3 Fe(OH)2 Fe^2+ + 2OH^- ksp = 2.3*10^-3 + x^2 4.87*10^-17 = 2.3*10^-3 + x^2 x= 1.46*10^-7 c) MgBr2 + KOH --> Mg(OH)2 + 2KBr Mg(OH)2 Mg^2+ + 2OH^- ksp = 2.0*10^-3 + x^2 2.06*10^-13 = 2.0*10^-3 + x^2 x= 1.015*10^-5

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