determination of solubility product of calcium hydroxide
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Calcium hydroxide, Ca(OH)2, is an ionic solid that is slightly soluble in water. A saturated solution is an equilibrium, that can be represented by the following equation:
Ca(OH)2 (s)  Ca2+ (aq) + 2OH- (aq)
Because the equilibrium expression is a "product" (the result of multiplying numbers together), and the numbers that you multiply depend on the solubility of the solid, this kind of an equilibrium constant is called the "solubility product", and is represented by the symbol Ksp. Whenever you see the symbol Ksp you know that it is referring to a solubility equation, written with the solid to the left of the equilibrium sign, and the dissolved products to the right. The Ksp for this reaction will be:
Ksp = [Ca2+ (aq)][OH- (aq)]2
Remember that the solid state is not included in a Ksp expression.
Every substance that forms a saturated solution will have a Ksp. However, for very soluble substances like NaCl, the value is so large that the concept is rarely used. In slight and low solubility substances, the value of Kspis a useful quantity that lets us predict and calculate solubilities of substances in solution. In this experiment you will collect the data that allows you to calculate the solubility of Ca(OH)2.

Phenolphthalein indicator should be titrated to a very light pink endpoint.
The hydroxide ions formed when Ca(OH)2 (s) dissolves can be measured by titration with an acid. From the balanced equilibrium equation,
Ca(OH)2 (s)  Ca2+ (aq) + 2OH- (aq
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Ca(OH)2 (s)  Ca2+ (aq) + 2OH- (aq)
Because the equilibrium expression is a "product" (the result of multiplying numbers together), and the numbers that you multiply depend on the solubility of the solid, this kind of an equilibrium constant is called the "solubility product", and is represented by the symbol Ksp. Whenever you see the symbol Ksp you know that it is referring to a solubility equation, written with the solid to the left of the equilibrium sign, and the dissolved products to the right. The Ksp for this reaction will be:
Ksp = [Ca2+ (aq)][OH- (aq)]2
Remember that the solid state is not included in a Ksp expression.
Every substance that forms a saturated solution will have a Ksp. However, for very soluble substances like NaCl, the value is so large that the concept is rarely used. In slight and low solubility substances, the value of Kspis a useful quantity that lets us predict and calculate solubilities of substances in solution. In this experiment you will collect the data that allows you to calculate the solubility of Ca(OH)2.

Phenolphthalein indicator should be titrated to a very light pink endpoint.
The hydroxide ions formed when Ca(OH)2 (s) dissolves can be measured by titration with an acid. From the balanced equilibrium equation,
Ca(OH)2 (s)  Ca2+ (aq) + 2OH- (aq
HOPE IT HELPS
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