1115 - Some practice while you wait: Ionic solid, forms...

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Some practice while you wait: CH OH Ionic solid, forms ions more soluble in water Polar molecule more soluble in water Mostly nonpolar molecule more soluble in octane Polar molecule more soluble in water
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Precipitation - when an insoluble substance is formed from two different soluble substances. AD precipitates from a solution of AB and CD! AB A 1+ + B 1- CD C 1+ + D 1- AB and CD are soluble. Mix AB and CD together. AB + CD A 1+ 1- 1+ 1- Section 10.7 Precipitation AD(s) What if AD is insoluble?
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To predict solubility of ionic solids, you must know the solubility rules . Section 10.7 Precipitation Generally: charge solubility Guidelines only!
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Section 10.7 Precipitation Example: AgNO Ag + NO However, mix these solutions together: AgNO 3 + KCl K 1+ + NO 3 1- + AgCl(s) Another example: Pb(NO 3 ) 2 Pb 2+ + 2NO 3 1- and KCl K 1+ + Cl 1- However, mix these solutions together: Pb(NO 3 ) 2 + 2KCl 2K 1+ + 2NO 3 1- + PbCl 2 (s)
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Section 10.8 Net Equations 3Cu(NO 3 ) 2 + 2Na 3 PO 4 Cation1+Anion2 Cation2+Anion1 3Cu 2+ + 6NO 3 1– + 6Na 1+ + 2PO 4 3– Both are soluble so ions are formed: Insoluble! Thus a ppt forms. Soluble No rxn.
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Section 10.8 Net Equations 3Cu(NO 3 ) 2 (aq) + 2Na 3 PO 4 (aq) Cu 3 (PO 4 ) 2 (s) + 6NaNO 3 (aq) The whole reaction could be written: 3Cu 2+ (aq) + 6NO 3 1– (aq) + 6Na + (aq) + 2PO 4 3– (aq) Cu 3 (PO 4 ) 2 1+ (aq) 3 1– (aq) Or, as ionic species: Net ionic equation: ( remove duplication) 3Cu 2+ (aq) + 2PO 4 3– (aq) Cu 3 (PO 4 ) 2 Na 1+ and NO 3 1- are “ spectator ions
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Section 10.8 Net Equations You practice on the following: 2AgNO 3 + CoCl 2 2AgCl + Co(NO 3 ) 2 3CoCl 2 + 2Na 3 PO 4 Co 3 (PO 4 ) 2 + 6NaCl
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Section 10.8 Net Equations Pb(NO ) + 2KI PbI + 2KNO Pb (aq) + 2NO (aq) + 2K (aq) + 2I (aq) All the ionic species: Remove spectator ions to get the net equation :
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Section 10.8 Net Equations 2AgNO 3 + CoCl 2 2AgCl + Co(NO 3 ) 2 2Ag 1+ (aq) + 2NO 3 1- (aq) + Co 2+ (aq) + 2Cl1- (aq) 2AgCl (s) + Co 2+
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This note was uploaded on 06/14/2009 for the course CH 101 taught by Professor Bigham during the Spring '08 term at N.C. State.

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1115 - Some practice while you wait: Ionic solid, forms...

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