Double Displacement Reactions SCH3U. Double Displacement Reaction  The positive ions of two ionic compounds switch places and make two new ionic compounds.

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Presentation transcript:

Double Displacement Reactions SCH3U

Double Displacement Reaction  The positive ions of two ionic compounds switch places and make two new ionic compounds. BaCl 2 (aq) + Na 2 SO 4 (aq)  2 NaCl (aq) + BaSO 4 (s) +  AXBY AY + BX +  +

Types of Double Displacement Rxns  A reaction that forms a solidsolid  AgNO 3 (aq) + NaCl (aq)  AgCl (s) + NaNO 3 (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)  CH 3 COOH (aq) + NaHCO 3 (s)  NaCH 3 COO (aq) + H 2 CO 3 (aq)  Decomposition: H 2 CO 3 (aq)  H 2 O (l) + CO 2 (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  H 2 SO 4 (aq) + Ca(OH) 2 (aq)  CaSO 4 (aq) + 2 H 2 O (l) If one reactant…And the other reactant… Then the product includes: Is an aqueous salt A precipitate Is an acidHas carbonate ionsWater and carbon dioxide Is an acidHas hydroxide ionswater Any other pairs, see solubility table