4) The solubility of ferrous hydroxide, also called iron(ll) hydroxide, Fe(OH),,

Question

4) The solubility of ferrous hydroxide, also called iron(ll) hydroxide, Fe(OH),, is 143 x 10" gram per liter at 25 C. a) Write a balanced equation for the solubility equilibrium b) Write the expression for the solubility product constant, Kp c) Calculate the Ksp of Fe(OH), at 25 °C. What is the molar solubility of plumbous sulfate in a) pure water; and b) in 0.0500 M plumbous nitrate? Ksp plumbous sulfate 1.6x109 5) 6) a) Why is the solubility of NaCI unaffected by addition of HNO, or NaOH? b) Why is the solubility of NH Cl greater in basic solution than in acidic solution? c) Why does the solubility of CaCO, increase as the pH decreases (as acid is added)? 7) Will a ppt form upon mixing 75.0 mL of a 0.0125 M ferric nitrate sln with 100.0 mL of a 0.250 M sodunn hydroxide? (Ksp ferric hydroxide-1.6x10"")

Explanation / Answer

Q4

a)

Fe(OH)2(s) <--> Fe+2(aq) + 2OH-(aq)

b)

Ksp = [Fe+2][OH-]^2

c)

we need

[Fe+2] and [OH-]

[Fe(OH)2] = mass/MW = (1.43*10^-3)/(89.8597) = 0.00001591 M

now..

[Fe+2] = [Fe(OH)2] = 0.00001591 M

[OH-] = 2[Fe(OH)2] = 2*0.00001591 = 0.00003182

Ksp = [Fe+2][OH-]^2

Ksp =0.00001591 * (0.00003182^2)

Ksp = 1.610*10^-14

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