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Precipitation Reaction

Precipitation Reaction. One type of a double replacement reaction. Occurs when you mix two solutions. The compounds in each solution are SOLUBLE. They can stay dissolved in water. When the solutions are mixed, the positive ions switch places. A. B. C. D. CB + AD. AB + CD .

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Precipitation Reaction

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  1. Precipitation Reaction One type of a double replacement reaction Occurs when you mix two solutions The compounds in each solution are SOLUBLE They can stay dissolved in water When the solutions are mixed, the positive ions switch places A B C D CB + AD AB + CD  Watch your oxidation states when you make the new compounds!

  2. Examples – Determine the two products from the mixture of • MgSO4 and CaCO3 • AgNO3 and NaCl • NaCl and SrO MgCO3 CaSO4 AgCl NaNO3 Since Na is +1 and O is -2 Na2O Since Sr is +2 and Cl is -1 SrCl2

  3. When forming new compounds, keep subscripts for polyatomic ions, but ignore other subscripts. AgNO3 and SrCl2 Keep this Ignore this Now combine Sr+2 with NO3- Sr(NO3)2 And combine Ag+ with Cl- AgCl Practice – Determine the products of the reaction between • KBr + NaCl • LiCl + CaBr2 • Na2SO4 + Ca(OH)2 • CaCl2 + Na2CO3  KCl + NaBr 2  2 LiBr + CaCl2  2 NaOH + CaSO4  CaCO3 + NaCl 2 Now you can write balanced equations

  4. Precipitation reactions only occur if one of the products is a precipitate Precipitate – Insoluble compound Will fall out of solution, does not stay mixed with water Na Cl Ag NO3 in soluble soluble AgCl Ag Na

  5. To find a precipitate, look for the INSOLUBLE compounds on Table F Left side Only precipitates will be Cl, Br, I Only when combined with Ag, Pb or Hg2 Only when combined with Ag, Pb, Ca, Sr or Ba SO4 Right side These will ALWAYS be precipitates, unless the exceptions occur Example – CO3 is always a precipitate except if it starts with Na, or another group 1 metal

  6. Example – Circle the precipitates • NH4Cl b. Ca(NO3)2 c. MgS d. CaCO3 e. LiOH • f. NaCl g. PbCl2 h. CuSO4 Example – Determine if a precipitate will form with the following. If it does, circle the precipitate • NaCl + AgNO3 • Li2S + CaCl2 • NaOH + ZnCl2 • CaCl2 +Sr(NO3)2 NaNO3 + AgCl Precipitate  CaS + LiCl 2 Precipitate  2 Precipitate NaCl + Zn(OH)2  2 Ca(NO3)2 + SrCl2 No precipitate – the reaction does not occur!

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