O 4/20/2016 11:55 PM A 57.4/100 t 4/12/2016 07:52 PM Gradebook Print Calculator

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O 4/20/2016 11:55 PM A 57.4/100 t 4/12/2016 07:52 PM Gradebook Print Calculator Periodic Table X Incorrect Question 14 of 19 Map A pling A generic salt, AB2, has a molar mass of 321 g/mol and a solubility of 2.10 g/L at 25 °C. What is the Ksp of this salt at 25 C? A Br(s Number sp 8.64 x 10 There is additional feedback available! View this feedback by clicking on the bottom divider bar, Click on the divider bar again to hide the additional feedback. Close AO Previous Give Up & View solution Try Again Next Ext Explanation

Explanation / Answer

For the given reaction, expression for Ksp will be : Ksp = [A2+][B-]2
Given at 25oC ,solubility of AB2 = 2.1 g/L and molar mass of AB2 = 321 g/mol
=> Molar Solubility of AB2 = 2.1/321 mol/L = 0.00654 mol/L = 6.54 x 10-3 mol/L
Now, There is a 1:1 ratio between AB2 and A2+, BUT there is a 1:2 ratio between AB2 and B¯. This means that, when 6.54 x 10-3 mole per liter of AB2 dissolves, it produces 6.54 x 10-3 mole per liter of A2+,
BUT (2 x 6.54 x 10-3 = 13.08 x 10-3) mole per liter of B¯ in solution

Substituting the values in the expression: Ksp = ( 6.54 x 10-3) x (13.08 x 10-3)2 = 1118.91 x 10-9
   => Ksp = 1.12 x 10-6

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