net-ionic-solubility-rules

net-ionic-solubility-rules - 3Cl PO43 Net ionic equations...

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Na + Al 3+ S 2– 2Ca 2 + PO 4 3– 3Cl Net ionic equations and solubility rules
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Review: forming ions Ionic (i.e. salt) refers to +ve ion plus -ve ion Usually this is a metal + non-metal or metal + polyatomic ion (e.g. NaCl, NaClO 3 , Li 2 CO 3 ) Polyatomic ions are listed on page 71 (aq) means aqueous (dissolved in water) For salts (aq) means the salt exists as ions NaCl(aq) is the same as: Na + (aq) + Cl (aq) Acids form ions: HCl(aq) is H + (aq) + Cl (aq), Bases form ions: NaOH(aq) is Na + + OH Q - how is charge determined (+1, -1, +2, etc.)? A - via valences (periodic table or see pg. 71) F, Cl gain one electron, thus forming F , Cl Ca loses two electrons, thus forming Ca 2+
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Charge can also be found via the compound E.g. in NaNO 3 (aq) if you know Na forms Na + , then NO 3 must be NO 3 (NaNO 3 is neutral) By knowing the valence of one element you can often determine the other valences Q - Write the ions that form from Al 2 (SO 4 ) 3 (aq)? Step 1 - look at the formula: Al 2 (SO 4 ) 3 (aq) Step 2 - determine valences: Al 3 (SO 4 ) 2 Background: valences and formulas (Al is 3+ according to the periodic table) Step 3 - write ions: 2Al 3+ (aq) + 3SO 4 2– (aq) Note that there are 2 aluminums because Al
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Practice with writing ions Q - Write ions for Na 2 CO 3 (aq) A - 2Na + (aq) + CO 3 2– (aq) (from the PT Na is 1+. There are 2, thus we have 2Na + . There is
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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net-ionic-solubility-rules - 3Cl PO43 Net ionic equations...

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