Potassium hydroxide is used to precipitate each of the cations from their respec

Question

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 each case. A - 2.8*10^-3 M Fe(NO3)2 B - 1.6*10^-3 M MgBr2 PLEASE READ QUESTION BEFORE YOU ANSWER!!

Explanation / Answer

example 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 each case. part a) 1.5×10^-2 M K CaCl2 part b) 2.3×10^-3 M Fe(NO3)2 part c) 2.0×10^-3 M MgBr2 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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