Double Replacement Reactions

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Double Replacement Reactions Cation exchange

description

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

Transcript of Double Replacement Reactions

Page 1: Double Replacement Reactions

Double Replacement Reactions

Cation exchange

Page 2: Double Replacement Reactions

Driving Force – Two compounds

Page 3: Double Replacement Reactions

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

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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

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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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