Ch4(5-8)Sept24Fa08a

Ch4(5-8)Sept24Fa08a - Chemistry 109 University of Nebraska...

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Chemistry 109 University of Nebraska FALL 2008 Wednesday 24 September 2008
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Precipitation Reactions When a salt dissolves in water, it produces cations and anions A _____________ forms if any new combinations of the ions form a salt that is __________ in water.
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Solubility Rules For Ionic Compounds in Water ( Table 4.1 ) 1. All common compounds of Group 1A(1) ions (Li + , Na + , K + , etc.) and ammonium ion (NH 4 + ) are soluble. 2. All common nitrates (NO 3 - ), acetates (CH 3 COO - or C 2 H 3 O 2 - ) and most perchlorates (ClO 4 - ) are soluble. 3. All common chlorides (Cl - ), bromides (Br - ) and iodides (I - ) are 1. All common metal hydroxides (OH - ) are insoluble, except those of 2. All common carbonates (CO 3 2- ) and phosphates (PO 4 3- ) are 3. All common sulfides (S 2- ) are insoluble except those of Group 1A(1), Soluble Ionic Compounds Insoluble Ionic Compounds
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What can happen when ions react 1. Two of them form an insoluble solid in water (a ______________) Precipitation reactions are also known as ___________ reactions.
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Metathesis Reaction M etathesis is a Greek term , meaning “to transpose or exchange” Pb(NO 3 ) 2 ( aq ) + 2 KI ( aq ) PbI 2 ( s ) + 2 KNO 3 ( aq ) AgNO 3 ( aq ) + KCl ( aq ) AgCl ( s ) + KNO 3 ( aq ) A X BY + AY BX +
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Also known as PRECIPITATION REACTIONS , they produce a heterogeneous mixture from homogeneous solutions.
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Ch4(5-8)Sept24Fa08a - Chemistry 109 University of Nebraska...

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