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 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

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.