Na + Al 3+ S 2– 2Ca 2+ PO 4 3– 3Cl – Net ionic equations and solubility rules 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.)? • F, Cl electron, thus forming • Ca electrons, thus forming • 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
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