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Double Displacement Reactions

Double Displacement Reactions. SCH3U. Double Displacement Reaction. The positive ions of two ionic compounds switch places and make two new ionic compounds. BX. AY. AX. BY. +. +. . +. . +. BaCl 2 ( aq ) + Na 2 SO 4 ( aq )  2 NaCl ( aq ) + Ba SO 4 (s).

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Double Displacement Reactions

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  1. DoubleDisplacement Reactions SCH3U

  2. DoubleDisplacement Reaction • The positive ions of two ionic compounds switch places and make two new ionic compounds. BX AY AX BY + +  +  + BaCl2 (aq) + Na2SO4 (aq)  2 NaCl (aq) + BaSO4 (s)

  3. 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

  4. 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

  5. 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) Any other pairs, see solubility table

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