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Lesson 4 Calculating Solubility

Lesson 4 Calculating Solubility. Calculate the solubility @ 25 o C for BaCrO 4 in units of g/L. BaCrO 4(s) ⇌ Ba 2+ + CrO 4 2-. s s s. Ksp = [Ba 2+ ][CrO 4 2- ]. Ksp = s 2. from page 5. 1.2 x 10 -10 = s 2. s = 1.1 x 10 -5 M. note that solubility units are M!.

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Lesson 4 Calculating Solubility

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  1. Lesson 4 Calculating Solubility

  2. Calculate the solubility@ 25oC for BaCrO4 in units of g/L. BaCrO4(s)⇌ Ba2+ + CrO42- ss s Ksp = [Ba2+][CrO42-] Ksp = s2 from page 5 1.2 x 10-10 = s2 s = 1.1 x 10-5 M note that solubility units are M! 1.1 x 10-5 mole x 253.3 g = 0.0028 g/L L 1 mole

  3. 2. Calculate the solubility @ 25oC for Cu(IO3)2 in units of g/L. Cu(IO3)2(s) ⇌ Cu2+ + 2IO3- ss2s Ksp = [Cu2+][IO3-]2 Ksp = [s][2s]2 Ksp = 4s3 6.9 x 10-8 = 4s3 s = 2.6 x 10-3 M x 413.3 g 2.584x 10-3moles = 1.1 g/L 1 mole L note sig figs are 2 like the Ksp!

  4. 3.Calculate the molar solubility @ 25oC for Fe(OH)3. Calculate the mass required to prepare 2.0 L of the above saturated solution. Fe(OH)3⇌ Fe3+ + 3OH- s s 3s Ksp = [Fe3+][OH-]3 Ksp = [s][3s]3 2.6 x 10-39 = 27s4 s = 9.906 x 10-11 M x 106.8 g 2.0 L x 9.906 x 10-11mole = 2.1 x 10-8 g L 1 mole

  5. Thesizeof the Kspis related to the solubilityof the ionic compound. For salts that are comparable (AB versus AB), the larger the Ksp of the salt, the greater is its solubility. 4. Indicate the solid with the greatest solubility. PbSO4 ZnS AgCl BeS low start on page 4 low low high One of These Things is not like the Other

  6. 5. Indicate the solid with the least solubility. PbSO4low ZnS low AgCl low BeS high start on page 4 1.8 x 10-8 2.0 x 10-25 use page 5 if required 1.8 x 10-10 The lowest ksp is the lowest solubility

  7. 6. A solution of AgNO3 is slowly added to a mixture containing 0.10 M I-, Cl-, Br-, and IO3-. The precipitate, which forms first, is AgI AgCl AgBr AgIO3 8.5 x 10-17 low low 1.8 x 10-10 low 5.4 x 10-13 low 3.2 x 10-8 lowest ksp – 1st ppt to form

  8. 7. A few drops of AgNO3 is added to four beakers containing 0.10 M I-, Cl-, Br-, and IO3-. A precipitate forms in three of the solutions. The solution that does not form a precipitate is? AgI AgCl AgBr AgIO3 low 8.5 x 10-17 low 1.8 x 10-10 low 5.4 x 10-13 low 3.2 x 10-8 highest ksp – last ppt to form Sodium acetate sculptures

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