Double replacement reactions
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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)

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Double Replacement Reactions

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Double replacement reactions

Double Replacement Reactions


Dr rxns occur in aqueous solutions

DR rxns occur in aqueous solutions

  • What happens when substances dissolve in water?

  • depends if substance is ionic or covalent


Dissolving

Dissolving

  • covalent substances (such as sugar can dissolve but molecules stay intact in solution)

  • C6H12O6(s)  C6H12O6(aq)

  • covalent substances:

    moleculesspread out in solution


Dissolving1

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


Double replacement reactions1

Double Replacement Reactions

  • occur when mix 2 ionic compounds together in an aqueous soln

  • 3 possible products:

    - liquid (H2O)

    - gas

    - solid


Reactions that form liquid water

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


Reactions that form gases

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)


Reactions producing solids

Reactions producing Solids

2 NaOH(aq) + CuCl2(aq) 

2 NaCl(aq) + Cu(OH)2(s)


Double replacement reactions

Reactions producing Solids

Precipitation reactions:

  • occur when an insoluble solid is formed as a result of chemical reaction

    solid precipitate forms - opposite of dissolving!


Double replacement reactions

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)


Double replacement reactions

Complete Ionic Equations

and

Net Ionic Equations


Double replacement reactions

Complete Ionic Equations

show all ions involved in a chemical reaction taking place in aqueous solution


Ex complete ionic equation

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)


Net ionic equations show only the i ons that form a non aqueous product in a dr chemical reaction

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


Solid as product

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


Water as product

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)


Gases as product

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)


Conservation of charge

Conservation of Charge

total charge (reactant side)

must =

total charge on product side


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