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Double Replacement Reactions

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.

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Double Replacement Reactions

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  1. Double Replacement Reactions Cation exchange

  2. 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

  3. 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

  4. Formation of a ppt – net ionic • Determine if the reactants are soluble or insoluble. Soluble – separate into ions, insoluble – keep together. • Determine the driving force….which combination of species forms a ppt. • Write products with precipitates together and solubles as separated. • Cross out species that appear exactly the same on both sides of the equation. • Write the Balanced Equation with what remains

  5. 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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