Net Ionic Equations Continued!

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Presentation transcript:

Net Ionic Equations Continued!

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

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

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 “Net Ionic” Equation: Pb2+(aq) + 2I-(aq)  PbI2(s)

Solubility Rules

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

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

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

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

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

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

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

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

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

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