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Ionic Equations

Ionic Equations. Deriving TOTAL and NET ionic equations from molecular equations. Molecular equations. Show all substances as elements or compounds using appropriate formulae Identify as solid (s), gas (g), liquid (l) or dissolved (aq) In these equations essential to show states

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Ionic Equations

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  1. Ionic Equations Deriving TOTAL and NET ionic equations from molecular equations

  2. Molecular equations • Show all substances as elements or compounds using appropriate formulae • Identify as solid (s), gas (g), liquid (l) or dissolved (aq) • In these equations essential to show states Pb(NO3)2(aq) + 2KI(aq) = 2KNO3(aq) + PbI2(s)

  3. Total ionic equations • For all dissolved substances show as constituent ions (except weak acids or other weak electrolytes) • All others show as molecular formula Pb(NO3)2(aq) + 2KI(aq) = 2KNO3(aq) + PbI2(s) Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) = 2K+(aq) + 2NO3-(aq) + PbI2(s)

  4. Net ionic equations • Spectator ions are those ions that do not undergo a change; they do not participate in the chemical change and are the same on both sides of the equation • Remove all spectator ions from the equation Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2I-(aq) = 2K+(aq) + 2NO3-(aq) + PbI2(s)

  5. Net ionic equations Pb2+(aq) + 2I-(aq) = PbI2(s) • Mass and charge must still balance, although overall charge may not be neutral in a net ionic equation

  6. Strong electrolytes are ionized, weak electrolytes are not

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