solubility constants and gravimetric methods of analysis post

# Solubility constants and gravimetric methods of analysis post

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Solubility constants

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What are solubility constants Most sparingly soluble salts are  completely dissociated in a saturated  aqueous solution. Ba(IO 3 ) 2          Ba +2 ( aq )  +  2IO 3 - ( aq )
What are solubility constants The equilibrium constant can be written: Since the Ba(IO 3 ) 2  is in the solid state  and is separate from but in contact with  the saturated solution:

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What are solubility constants The equilibrium  constant can be  rewritten as: Where the new constant is known as  the solubility-product constant or the  solubility product
What are solubility constants Tables of solubility constants are  available in the literature

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Calculating the solubility of a  precipitate or solid in water                  PbI 2   =  Pb 2+   +  2I -                               x          2x                   Ksp = K[PbI 2  (s)] = [Pb 2+ ][I - ] 2  = 7.9 X 10 -9                     7.9 X 10 -9   = [x][2x] 2  = 4x 3                                            x  = 1.25 X 10 -3  M/L
Calculating the solubility of a  precipitate or solid in water To calculate the weight PbI 2  dissolved in  the solution multiply by the Mol. Wt. of  PbI since the moles of PbI 2  in solution  is equal to the concentration of Pb 2+

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Using solubility constants
Using solubility constants

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The addition of an ion to a solution that is  common to a precipitate reduces the solubility  according to the principle of Le Chatelier. How does a common ion effect  the solubility of a precipitate
Consider a solution containing a saturated  solution of AgCl.                       AgCl = Ag +  + Cl - If NaCl is added to this solution, the  equilibrium will be shifted to the left and the  solubility of AgCl will decrease. How does a common ion effect  the solubility of a precipitate

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How does a common ion effect  the solubility of a precipitate If we have a saturated solution of AgCl: AgCl = Ag +  + Cl -               x         x Ksp = 1.56 X 10 -10   = X 2 X = 1.25 X 10 -5
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Solubility constants and gravimetric methods of analysis post

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