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Double Replacement Reactions. Cation exchange. Driving Force – Two compounds. There must be a driving force for the reaction to take place, otherwise it will remain as a mixture. Driving Forces: Formation of a precipitate ( ppt ) Formation of a gas Formations of a molecular compound. - PowerPoint PPT Presentation
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Double Replacement Reactions
Cation exchange
Driving Force – Two compounds
Examples Formation of a ppt Ag NO3 + LiBr
Ag+ + Br - AgBr
Formation of a gas HCl + K2SO3
H+ + SO32- H2O + SO2
Formation of a molecular compound HF + SiO2
HF + SiO2 H2O + SiF4
Formation of a ppt – net ionic
1. Determine if the reactants are soluble or insoluble. Soluble – separate into ions, insoluble – keep together.
2. Determine the driving force….which combination of species forms a ppt.
3. Write products with precipitates together and solubles as separated.
4. Cross out species that appear exactly the same on both sides of the equation.
5. Write the Balanced Equation with what remains
Example Copper (II) sulfate is added to sodium sulfide
CuSO4 + Na2S CuS + Na2SO4
Cu2+ + SO42- + 2Na+ + S2- CuS + 2Na+
+ SO42-
Net Ionic Equation Cu2+ + S2- CuS
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