Double Displacement Reactions

SCH3U

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

+ +

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

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

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