What is the molar solubility of Fe(OH)3 (s) in a solution that is buffered at pH 2.50 at 25 °C? The Ksp of Fe(OH)3 is 6.3 × 10-38 at 25 °C.

The following question is taken from a Chemistry Advanced Placement Examination and is used with the permission of the Educational Testing Service. Solve the following problem: MgF2(s)Mg2+(aq)+2F(aq) In a saturated solution of MgF2 at 18 C, the concentration of Mg2+ is 1.21103M . The equilibrium is represented by the preceding equation. (a) Write the expression for the solubility-product constant, Ksp, and calculate its value at 18 C. (b) Calculate the equilibrium concentration of Mg2+ in 1.000 L of saturated MgF2 solution at 18 C to which 0.100 mol of solid KF has been added. The KF dissolves completely. Assume the volume change is negligible. (c) Predict whether a precipitate of MgF2 will form when 100.0 mL of a 3.00103 -M solution of Mg(NO3)2 is mixed with 200.0 mL of a .2.00103 -M solution of NaF at 18 C. Show the calculations to support your prediction.. (d) At 27 C the concentration of Mg2+ in a saturated solution of MgF2 is 1.17103M . Is the dissolving of MgF2 in water all endothermic or an exothermic process? Give an explanation to support your conclusion.

The Ksp of Al(OH)3 is 2 1032. At what pH will a 0.2-M Al3+ solution begin to show precipitation of Al(OH)3?

The ore cinnabar (HgS) is an important source of mercury. Cinnabar is a red solid whose solubility in water is 5.5 X 10-2 mol L-1. Calculate its \p. What is its solubility' in grams per 100 g of water?

Calculate the solubility (in M) of cobalt(II) hydroxide, Co(OH)2(s) in H2O. Ksp = 1.70×10-16 at a specific temperature   What is the pH of this solution of cobalt(II) hydroxide?

Calculate the solubility (in M) of cobalt(II) hydroxide, Co(OH)2(s) in H2O. Ksp = 1.00×10-16 at a specific temperature.

Calculate the molar solubility of silver (I) carbonate, Ag2CO3, in pure water at 25 ˚C. The Ksp of Ag2CO3 at 25 ˚C is 8.1 x 10-12.

The solubility of lead(II) fluoride, PbF2, in pure water is 2.1 × 10–3 moles per liter. Calculate the value of Ksp for lead(II) fluoride from this data.

What is the molar solubility of BaSO4 (molar mass=233.4g/mol, Ksp=1.1*10^-10) in a 0.050 M solution of BaCl2?

The concentration of calcium carbonate in a sample of water saturated with the solid was found to be 7.00 x 10-5 moldm-3 at 200C. What is the solubility product of calcium carbonate at this temperature?