net ionic equations continued!
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Net Ionic Equations Continued!
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NaCl is soluble in water. Solid NaCl dissociates into Na+ and Cl- ions in aqueous solution:NaCl(s) Na+
(aq) + Cl-
(aq)
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Pb(NO3)2 + 2NaI PbI2 + 2NaNO3
(aq) (aq) (s) (aq)
See solubility ruleson p 344 of the text
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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)
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Solubility Rules
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For the exam: know how to use solubility rules to predict whether an ionic compound is insoluble or not
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Net Ionic Equations Revisited:1) Write the (balanced!) molecular equation first
- Reaction products: swap cations and anions- Predict solubility (using Solubility rules)
2) Write the complete ionic equation next- (s) compounds don’t ionize- (aq) compounds do ionizeion subscripts in the molecular equation become
coefficients in the complete ionic equation!
3) Write the net ionic equation next- cancel spectator ions
The net ionic equation is a “simplified” form of the complete ionic equation
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Example
Ba(NO3)2 + NiSO4
Balanced Molecular Equation:
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Ba(NO3)2 + NiSO4 Ni(NO3)2 + BaSO4
Balanced Molecular Equation:
Example
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Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2 (aq)+ BaSO4(s)
Balanced Molecular Equation:
Example
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Ba2+(aq) + 2NO3
-(aq) + Ni2+
(aq) + SO42-
(aq)
Ni2+(aq) + 2NO3
-(aq) + BaSO4 (s)
Balanced Molecular Equation:
Complete Ionic Equation:
Example
Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2 (aq)+ BaSO4(s)
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Ba2+(aq) + 2NO3
-(aq) + Ni2+
(aq) + SO42-
(aq)
Ni2+(aq) + 2NO3
-(aq) + BaSO4 (s)
Balanced Molecular Equation:
Complete Ionic Equation:
Example
Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2 (aq)+ BaSO4(s)
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Ba2+(aq) + 2NO3
-(aq) + Ni2+
(aq) + SO42-
(aq)
Ni2+(aq) + 2NO3
-(aq) + BaSO4 (s)
Balanced Molecular Equation:
Complete Ionic Equation:
Example
Ba(NO3)2(aq)+ NiSO4(aq) Ni(NO3)2 (aq)+ BaSO4(s)
Net Ionic Equation:Ba2+
(aq) + SO42-
(aq) BaSO4 (s)
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What is the Net Ionic Equation for the reaction: HCl(aq) + NaOH(aq) ?
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HCl(aq) + NaOH(aq) H2O(l) + NaCl(aq)
H+(aq) + -OH(aq) H2O(l)