Solubility & Ksp & Nuclear.

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Presentation transcript:

Solubility & Ksp & Nuclear

Ksp Ksp - the study of the solubility of insoluble ionic compounds ??? Ksp - solubility product constant

Writing Ksp Expressions CaF2 (s)  Ca +2 + 2F- Mg3(PO4)2 (s)  3Mg +2 + 2PO4 -3 BaSO4 (s)  Ba +2 + SO4 -2

Example The solubility of CuBr is 2.0 x 10-4 M. What is the value of Ksp?

Example 2 What is the molar solubility of Ag2S if the Ksp is 1.6 x 10-49?

Example 3 What is the molar solubility of bismuth (III) sulfide if the Ksp is 1.1 x 10-73?

Example 4 The pH of a solution of Fe(OH)3 is 2. What is the molar solubility? Ksp = 4 x 10 -38.

Will a solid form??? Compare Ksp to Qsp Q > K = yes ppt will form Q < K = no ppt Q is reaction quotient…just like K but not at equilibrium

Example Will a ppt form? 50.0 ml of a 0.00025 M Na3PO4 solution is mixed with 50.0 ml of 0.0025 M BaCl2. Ksp of Ba3(PO4)2 is 6 x 10-39.

Competing ppt NaCl is added to a 50 ml beaker that contains a mixture of 0.00015 M Pb(NO3)2 and 0.00035 M AgNO3. What ppt will form 1st? Show your work.