1 / 18

Double Replacement Reactions

Double Replacement Reactions. DR rxns occur in aqueous solutions. What happens when substances dissolve in water?. depends if substance is ionic or covalent. Dissolving. c ovalent substances (such as sugar can dissolve but molecules stay intact in solution)

vinaya
Download Presentation

Double Replacement Reactions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Double Replacement Reactions

  2. DR rxns occur in aqueous solutions • What happens when substances dissolve in water? • depends if substance is ionic or covalent

  3. Dissolving • covalent substances (such as sugar can dissolve but molecules stay intact in solution) • C6H12O6(s)  C6H12O6(aq) • covalent substances: moleculesspread out in solution

  4. Dissolving • Ionic substances ionize (dissociate) when dissolve; molecules do not remain intact • NaCl(s)  Na+1(aq) + Cl-1(aq) • Ionic substances: ions spread out in solution

  5. Double Replacement Reactions • occur when mix 2 ionic compounds together in an aqueous soln • 3 possible products: - liquid (H2O) - gas - solid

  6. Reactions that form liquid water HBr(aq) + NaOH(aq)  H2O(l) + NaBr(aq) aqueous refers to something dissolved in water so when water is a product it is labeled as liquid NOT aqueous

  7. H2O(l) + CO2(g) Reactions that form Gases HCl(aq) + NaHCO3(aq)  H2CO3(aq) + NaCl(aq) HCl(aq) + NaHCO3(aq)  H2O(l) + CO2(g) + NaCl(aq)

  8. Reactions producing Solids 2 NaOH(aq) + CuCl2(aq)  2 NaCl(aq) + Cu(OH)2(s)

  9. Reactions producing Solids Precipitation reactions: • occur when an insoluble solid is formed as a result of chemical reaction solid precipitate forms - opposite of dissolving!

  10. So how do you know if a product of a DR reaction is aqueous or a solid, liquid or gas? Table F is used to determine if a product is soluble or not If soluble: (aq) If not soluble: (s)

  11. Complete Ionic Equations and Net Ionic Equations

  12. Complete Ionic Equations show all ions involved in a chemical reaction taking place in aqueous solution

  13. Ex: Complete Ionic Equation NaOH(aq) + CuCl2(aq)  2 NaCl(aq) + Cu(OH)2(s) Na+1(aq) + 2OH-1(aq) + Cu2+(aq) + 2Cl-1(aq)  2Na+1(aq) + 2Cl-1(aq) + Cu(OH)2(s)

  14. Net Ionic Equationsshow only the ions that form a non-aqueous product in a DR chemical reaction

  15. Net ionic equation: 2OH-1(aq) + Cu2+(aq)  Cu(OH)2(s) Solid as product Complete ionic equation: 2Na+1(aq) + 2OH-1(aq) + Cu2+(aq) + 2Cl-1(aq)  2Na+1(aq) + 2Cl-1(aq) + Cu(OH)2(s) • Notice some ions do not participate in reaction • known as spectator ions • cross out spectator ions to get net ionic equation

  16. Net ionic equation: H+1(aq) + OH-1(aq)  H2O(l) Water as product HBr(aq) + NaOH(aq)  H2O(l) + NaBr(aq) Complete ionic equation: H+1(aq) + Br-1(aq) + Na+1(aq) + OH-1(aq)  H2O(l) + Na+1(aq) + Br-1(aq)

  17. Net ionic equation: H+1(aq) + HCO3-1(aq)  H2O(l) + CO2(g) Gases as product HCl(aq) + NaHCO3(aq)  H2O(l) + CO2(g) + NaCl(aq) Complete ionic equation: H+1(aq) + Cl-1(aq) + Na+1(aq) + HCO3-1(aq)  H2O(l) + CO2(g) + Na+1(aq) + Cl-1(aq)

  18. Conservation of Charge total charge (reactant side) must = total charge on product side

More Related