Predicting Solubility PDF

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Predicting Solubility Notes...

Description

Predicting Solubility 

The trial ion product Qsp may be defined similarily to the reaction quotient of a chemical system.

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Qsp is used to predict precipitation of a solute similar to Q predicting whether a chemical system is in a state of equilibrium or not.

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As always, Q has the same form as K, but typically involves non-equilibrium concentrations.

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Precipitation can be predicted by comparing Qsp with Ksp:

Relations hip Solution Type

Qsp < Ksp

Result

Unsaturated

More salt can dissolve without precipitate forming

Qsp = Ksp

saturated

no more salt can dissolve

Qsp > Ksp

(unlikely) super saturated

Salt will precipitate out until Qsp=Ksp (it will proceed to the left and then crystalize)...