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Chemistry / Chemistry: The Central Science 13 / Chapter 17.16SE / Problem 2PE

Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus

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QUESTION:

Problem 2PE

Predicting Whether a Precipitate Forms

Does a precipitate form when 0.10 L of 8.0 x 10-3 M Pb x (N03)2 is added to 0.40 L of 5.0 x 10-3 M Na2S04?

Does a precipitate form when 0.050 L of 2.0 x 10-2 M NaF is mixed with 0.010 L of 1.0 x 10-2 M Ca(N03)2?

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QUESTION:

Problem 2PE

Predicting Whether a Precipitate Forms

Does a precipitate form when 0.10 L of 8.0 x 10-3 M Pb x (N03)2 is added to 0.40 L of 5.0 x 10-3 M Na2S04?

Does a precipitate form when 0.050 L of 2.0 x 10-2 M NaF is mixed with 0.010 L of 1.0 x 10-2 M Ca(N03)2?

ANSWER:

Step 1 of 4

In the case of ionic compounds the term which is the same as equilibrium constant expression for a reaction, the only difference is that it is used at any other state than equilibrium. In case of solubility equilibrium, the and are related in order to predict the direction of equilibrium as follows:

$\bullet{}$ , the solution is saturated and at equilibrium

$\bullet{}$ , the solution is unsaturated, the equilibrium will be shifted towards right

$\bullet{}$ , the solution will be supersaturated, the equilibrium will be shifted towards left and precipitate is formed.

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