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Double Displacement Reactions
SCH3U
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Double Displacement Reaction The positive ions of two ionic compounds switch
places and make two new ionic compounds.
BaCl2 (aq) + Na2SO4 (aq) 2 NaCl (aq) + BaSO4 (s)
+ AX BY AY + BX
+ +
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Types of Double Displacement Rxns A reaction that forms a solid
AgNO3 (aq) + NaCl (aq) AgCl (s) + NaNO3 (aq)
How do know if a precipitate will be formed? Solubility chart
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Types of Double Displacement Rxns A reaction that forms a gas Many of these reactions are two reactions in rapid
succession. (Vinegar and baking soda volcano) Acetic acid + sodium hydrogen carbonate sodium
acetate + carbonic acid (hydrogen carbonate) CH3COOH (aq) + NaHCO3 (s) NaCH3COO (aq) +
H2CO3 (aq) Decomposition: H2CO3 (aq) H2O (l) + CO2 (g)
Acid + compound containing carbonate ion ionic compound + water + carbon dioxide
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Types of Double Displacement Rxns A reaction that forms water (neutralization)
Acid + base water + ionic compound Sulfuric acid + calcium hydroxide calcium
sulfate + water H2SO4 (aq) + Ca(OH)2 (aq) CaSO4 (aq) + 2 H2O (l)
If one reactant… And the other reactant…
Then the product includes:
Is an aqueous salt Is an aqueous salt A precipitate
Is an acid Has carbonate ions
Water and carbon dioxide
Is an acid Has hydroxide ions water
Any other pairs, see solubility table