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Net Ionic Equations Continued!

Net Ionic Equations Continued!. NaCl is soluble in water. Solid NaCl dissociates into Na + and Cl - ions in aqueous solution: NaCl (s)  Na + ( aq ) + Cl - ( aq ). Pb(NO 3 ) 2 + 2NaI  PbI 2 + 2NaNO 3 (aq) (aq) (s) (aq). See solubility rules

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Net Ionic Equations Continued!

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  1. Net Ionic Equations Continued!

  2. NaCl is soluble in water. Solid NaCldissociates into Na+ and Cl- ions in aqueous solution: NaCl(s) Na+(aq) + Cl-(aq)

  3. Pb(NO3)2 + 2NaI  PbI2 + 2NaNO3 (aq) (aq) (s) (aq) See solubility rules on p 344 of the text

  4. Net Ionic Equations Balanced Chemical Equation: Pb(NO3)2(aq) + 2NaI(aq)  PbI2(s) + 2NaNO3(aq) “Complete Ionic” Equation: Pb2+(aq) + 2NO3-(aq) + 2Na+(aq)+ 2I-(aq)  PbI2(s) + 2Na+(aq) + 2NO3-(aq) Cancel the “spectator ions” that appear on both sides of the arrow Pb2+(aq) + 2NO3-(aq) + 2Na+(aq)+ 2I-(aq)  PbI2(s) + 2Na+(aq) + 2NO3-(aq) “Net Ionic” Equation: Pb2+(aq) + 2I-(aq)  PbI2(s)

  5. Solubility Rules

  6. For the exam: know how to use solubility rules to predict whether an ionic compound is insoluble or not

  7. Net Ionic Equations Revisited: • Write the (balanced!) molecular equation first • Reaction products: swap cations and anions • Predict solubility (using Solubility rules) • Write the complete ionic equation next • (s) compounds don’t ionize • (aq) compounds do ionize • ion subscripts in the molecular equation become coefficients in the complete ionic equation! • Write the net ionic equation next • cancel spectator ions • The net ionic equation is a “simplified” form • of the complete ionic equation

  8. Example Ba(NO3)2 + NiSO4 Balanced Molecular Equation:

  9. Example Ba(NO3)2 + NiSO4 Ni(NO3)2 + BaSO4 Balanced Molecular Equation:

  10. Example Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2(aq)+ BaSO4(s) Balanced Molecular Equation:

  11. Example Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2(aq)+ BaSO4(s) Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) + SO42-(aq) Ni2+(aq) + 2NO3-(aq) + BaSO4 (s) Balanced Molecular Equation: Complete Ionic Equation:

  12. Example Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2(aq)+ BaSO4(s) Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) + SO42-(aq) Ni2+(aq) + 2NO3-(aq) + BaSO4 (s) Balanced Molecular Equation: Complete Ionic Equation:

  13. Example Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2(aq)+ BaSO4(s) Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) +SO42-(aq) Ni2+(aq) + 2NO3-(aq) + BaSO4 (s) Balanced Molecular Equation: Complete Ionic Equation: Net Ionic Equation: Ba2+(aq) + SO42-(aq) BaSO4 (s)

  14. What is the Net Ionic Equation for the reaction: HCl(aq) + NaOH(aq) ?

  15. HCl(aq) + NaOH(aq) H2O(l) + NaCl(aq) H+(aq) + -OH(aq) H2O(l)

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