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15 - AP Chemistry Lab Determination of Ksp for a Sparingly...

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AP Chemistry Lab Brockport High School NY USA Determination of K sp for a Sparingly Soluble Salt Mr Keefer Introduction Inorganic substances are broadly classified as acids, bases, or salts. With few exceptions, all common salts are strong electrolytes. However, the solubilities of salts span a broad spectrum, ranging from slightly or sparingly soluble to very soluble. This experiment is concerned with heterogeneous equilibria of slightly soluble salts. For true equilibrium to exist between a solid and solution, the solution must be saturated. Thus the solubility equilibrium constant can be expressed solely on the concentrations of the ions. The rule for writing the solubility product expression states that K sp is equal to the product of the concentration of the ions in solution, each raised to the power of the coefficient in the equilibrium equation. For the salt MA, the dissociation proceeds as: MA  M + + A - K sp = [M + ][A - ] For the salt MA 2 , the dissociation proceeds as: MA 2  M + + 2A - K sp = [M + ][A - ] 2
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