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Double Replacement Reactions

Double Replacement Reactions. How do we know if these happen?. Double Replacement Reaction. 2 KI (aq) + Pb(NO 3 ) 2(aq)  2 KNO 3(aq) + PbI 2(s). Double Replacement Reactions. Two types of Double Replacement Reactions: Formation of an insoluble precipitate

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Double Replacement Reactions

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  1. Double Replacement Reactions How do we know if these happen?

  2. Double Replacement Reaction 2 KI(aq) + Pb(NO3)2(aq) 2 KNO3(aq) + PbI2(s)

  3. Double Replacement Reactions • Two types of Double Replacement Reactions: • Formation of an insoluble precipitate • NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s) • Formation of a gas • Acid + salt → gas + another salt • H2SO4(aq) + Na2S(aq) → H2S(g) + Na2SO4(aq)

  4. Solubility Rules • All sodium, potassium, and ammonium salts are soluble • All acetate, nitrate, and chlorate salts are soluble • All halide salts (F, Cl, Br, I) are soluble • Except lead (II), silver, and mercury (I) • All sulfates are soluble • Except calcium, barium, lead (II), and silver • All carbonates, phosphates, and sulfides are INSOLUBLE • Except sodium, potassium, ammonium

  5. Ionic Equations • Since ionic compounds (salts) exist as ions in solution, a precipitation reaction can be shown as ions: • NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s) • Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) → Na+(aq) + NO3-(aq) +AgCl(s) • This is the ionic equation for the reaction • Be careful with coefficients and subscripts from balanced formula equations

  6. Net Ionic Equations • Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) → Na+(aq) + NO3-(aq) +AgCl(s) • Na+ and NO3- ions are on both side, so they can be cancelled: • Cl-(aq) + Ag+(aq) → AgCl(s) • Na+ and NO3- are spectator ions • They are soluble on both sides of the ionic equation • The net ionic equation shows the reaction without the spectator ions • The net ionic equation shows which ions react and how the reaction occurs

  7. For the following sets of reactants… • Predict if a reaction will occur, based on solubility rules • Write a balanced formula equation, if the reaction occurs • Write a balanced ionic equation, if the reaction occurs • Write a balanced net ionic equation, if the reaction occurs

  8. Double Replacement Reactions • Potassium chromate + silver nitrate • Sodium hydroxide + iron (III) chloride • Sodium nitrate + calcium chloride • Lead (II) acetate + potassium sulfate • Silver nitrate + magnesium sulfate • Potassium hydroxide + nitric acid • Sodium acetate + potassium carbonate

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