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**Solubility Equilibria**

Ksp

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**Solubility & Solubility Product**

Even “insoluble” salts dissolve somewhat in water insoluble = less than 0.1 g per 100 g H2O The solubility of insoluble salts is described in terms of equilibrium between undissolved solid and aqueous ions produced AB (s) a A+(aq) + b B-(aq) Equilibrium constant called solubility product Ksp = [A+]a [B-]b If undissolved solid is in equilibrium with the solution, the solution is saturated Larger K = More Soluble for salts that produce same the number of ions 22

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**Ksp is the solubility product equilibrium constant at a given temperature.**

The solubility of a substance represents an equilibrium position for the system. First, write the dissociation equation of the ionic compound in water, including states. Then, set up the expression for K (you will only have the ions in this expression since the salt is a solid). Solve for a numerical value of Ksp using given data. Remember that for every one formula unit that breaks up, you will get equal molar concentrations for ions that are in a 1:1 ratio in the compound. If the ratio is not 1:1, adjust accordingly.

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**Calculate the solubility of AgI in water **

Example Calculate the solubility of AgI in water at 25°C if the value of Ksp = 1.5 x 10-16 Determine the balanced equation for the dissociation of the salt AgI (s) Ag+ (aq) + I- (aq) Determine the expression for the solubility product Same as the Equilibrium Constant Expression Ksp = [Ag+] [I-] 23

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**Calculate the solubility of AgI in water **

Example Calculate the solubility of AgI in water at 25°C if the value of Ksp = 1.5 x 10-16 Define the concentrations of dissolved ions in terms of x AgI (s) Ag+ (aq) + I- (aq) Stoichiometry tells us that we get 1 mole of Ag+ and 1 mol I- for each mole of AgI dissolved Let x = [Ag+], then [I-] = x 24

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**Calculate the solubility of AgI in water **

Example Calculate the solubility of AgI in water at 25°C if the value of Ksp = 1.5 x 10-16 Plug the ion concentrations into the expression for the solubility product and solve for Ksp [Ag+] = [I-] = x [Ag+] = 1.2 x 10-8 mol/L = [AgI] The solubility of AgI (at 25°C) = 1.2 x 10-8 M 25

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Aqueous Systems Ks and Solubility expressions. So far we have recalled… Definitions of equilibrium reactions Factors that can affect the position.

Aqueous Systems Ks and Solubility expressions. So far we have recalled… Definitions of equilibrium reactions Factors that can affect the position.

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