iPad 72%- 3:18 PM Lecture 17 Insert Draw Design Transitions Animations Slide Sho

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iPad 72%- 3:18 PM Lecture 17 Insert Draw Design Transitions Animations Slide ShowReview 8 a g+ Home New Slide Layout Practice Problem: Calculating Molar Solubilities from Ksp 18 EXAMPLE Calculating Molar Solubility from Kp Cakculate the molar solubility of PbCl in pure waber Begin by writing the reaction by which sold PbCl, dissolves into its constituent aqueous ions and write the comesponding spesson for K Refer to the stoichiometry of the reaction and prepare an ICE table, showing PC)2CT (oy) the equilibeium concentrations of Phb and CT relative to S, the amount of PeCl that dissolves Change 28 Equil 25 [m/Ta Substitute the equilibrium expressions for [m/+ ] and [cr ] from the previous step into the axpeession for K k, Solve for S and substiute the numerical valu f K(from Table 18.2) to calculane S 1.17 X 10 s-1 -1.43 × 10-2 M Calculate the molar solublity of Fe(OH) in pure water © 2015 Pearson Education, Inc. Slide 7 of 27 Notes

Explanation / Answer

Ksp of PbCl2 = 1.17 x 10^-5

PbCl2 -------------> Pb+2   + 2Cl-

                                  S            2S

Ksp = [Pb+2][Cl-]^2

1.17 x 10^-5 = S x (2S)^2

1.17 x 10^-5 = 4 S^3

S3 = 1.17 x 10^-5 / 4

S3 = 2.925 x 10^-6

S = (2.925 x 10^-6 )1/3

   = (2.925 x 10^-6 )^0.33

S = 1.43 x 10^-2 M

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