Net Ionic Equations (8-4) - Lapeer East High School

Net Ionic Equations (8-4) - Lapeer East High School

Net Ionic Equations (8-4) Show only the species (atoms/ions) participating in a reaction o Single displacement reaction exchange electrons o Double displacement reaction form new bonds (ionic or covalent) Steps 1. From formula equation write complete ionic equation use ion symbols for aqueous species use element, formula symbols for (g), (l), (s) 2. Cancel spectator ions (ions not forming new bonds) Can be written for: o Single Displacement Reactions (electron transfer reactions) One spectator ion

Charges must balance o Double Displacement Reactions (bond forming reactions) Two spectator ions Charges on reactants side must sum up to zero To predict the products of single-replacement reactions. Refer to the activity series (page 281 or appendix A, page 832) Is the free element above the element to be replaced in the compound? If yes, the reaction will occur Is the free element below the element to be

replaced in the compound? If yes, then a reaction will NOT occur The more active an element is, the more likely it will form compounds! Simple Activity Series of Metals Decreasing Reactivity K Ca Na Mg Al

Zn Fe Ni Pb H2 Cu Ag Au Activity Series of Halogens F2 Decreasing Reactivity Increasing

Reactivity Cl2 Increasing Reactivity Br2 I2 Example Single Displacement Check Activity Series first! Formula Equation: Cu (s) + 2 AgNO3 (aq) Cu(NO3)2 (aq) + 2 Ag (s)

Complete Ionic Equation: Cu (s) + 2 Ag1+ (aq) + 2 NO31- (aq) Cu2+ (aq) + 2 NO31- (aq) + 2 Ag (s) Identify Spectator Ion: NO31- is found on both sides of the yields sign and will cancel out. Net Ionic Equation: Cu (s) + 2 Ag1+ (aq) Cu2+ (aq) + 2 Ag (s) Note that charges balance. There are 2(+) charges on the reactants side and 2(+) charges on the products side. A Precipitation Reaction must produce a new solid substance. Use solubility rules (p. 284) to decide whether a precipitation will take place: Reactants are usually all soluble ionic compounds (will dissolve easily in water). If one of the ions from reactant #1 will form an

insoluble compound with an ion from reactant #2, a precipitation reaction will take place. (Insoluble means will not dissolve in water.) Some Simple Solubility Rules All compounds of Group 1 and NH4+ are soluble. All nitrates are soluble. All halides, except those of Ag+ and Pb2+, are soluble. All sulfates, except Ca2+, Sr2+, Ba2+, Hg22+, and Pb2+ are soluble. All carbonates, except those of Group 1 and NH4+, are insoluble. Most hydroxides, except those of Group 1 and NH4+, are insoluble.

Example Double Replacement Formula Equation: AgNO3 (aq) + NaCl (aq) AgCl(s) + NaNO3 (aq) Complete Ionic Equation: Ag1+ (aq) + NO31- (aq) + Na1+ (aq) + Cl1- (aq) AgCl (s) + Na1+ (aq) + NO31- (aq) Identify Spectator Ions: Na1+ and NO31- are found on both sides of the yields sign and will cancel out. Net Ionic Equation: Ag1+ (aq) + Cl1- (aq) AgCl (s) Note that charges balance. There is a net zero charge [(1+) + (1-)] on the reactants side and zero charge on the products side.

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