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Double Replacement Reactions
• OBJECTIVES:
• Recognize a double replacement (D.R.) reaction.
• Predict the products of a D.R. reaction.
• Predict whether a D.R. reaction will occur using
solubility rules or formation of gas or H2O(l)
(neutralization reaction).
• Complete and balance any D.R. that will occur.
Double Replacement – Page
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• Two things replace each other.
• AB + CD  AD + CB
• For Products:
• Formulas can and will change
• Look up charges for each ion
• Do 1:1 or criss-cross
• Once formulas are written:
• Take inventory
• Balance!
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Example
• Potassium Iodide + Lead (II) Nitrate
Will the Reaction Happen?
• A double replacement reaction will occur if:
• Water forms
• A gas forms
• A precipitate forms
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Let’s Practice on Page 23
CaCl2
Pb(NO3)2
AgC2H3O2
FeF2
Na2CO3
Rb3PO4
Page 27 Practice
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