Horvath Practice Problems 82

Horvath Practice Problems 82 - strong electrolytes weak...

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19 SOLUBILITY OF WEAK ELECTROLYTES We have been applying our ideas about equilibrium to acid base reactions. But these ideas are general and apply to any reaction. Here we consider application to the solubility of weak elec- trolytes. Consider a general dissolution reaction A n c B n a ( s ) ­ n c A n a + ( aq ) + n a B n c ( aq ) The equilibrium constant for this reaction is called the solubility product , K sp = £ A n a + ¤ n c £ B n c ¤ n a . Remember the A n c B n a ( s ) is a solid so we do not include it in the equilibrium constant. For example of the solubility product for Fe 2 ( SO 4 ) 3 is K sp = £ Fe 3+ ¤ 2 £ SO 2 4 ¤ 3 In the f rst semester we simply learned ionic compounds as
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Unformatted text preview: strong electrolytes, weak electrolytes and nonelectrolytes The solubility product gives us a way of ranking how soluble a compound is. For example Ca(OH) 2 has a K sp of 5 . 5 × 10 − 5 whereas CaF 2 has a K sp = 5 . 3 × 10 − 10 . We can say, quantitatively that Ca(OH) 2 is more soluble then CaF 2 . Lets say we want to know the concentration of Ca 2+ and OH − upon putting solid Ca(OH) 2 into a beaker. SOLUBILITY OF WEAK ELECTROLYTES 81...
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