Balancing Equations


AgNO3(aq) + PbBr2 (s) yields AgBr (s) + Pb(NO3)2 (aq)

REACTANTSvs the PRODUCTS Ag = 1 Ag = 1 NO3 = 1 NO3= 2 Pb = 1 Pb = 1 Br =2 Br = 1

Thebalanced equation would be equal to:

2AgNo3(aq)+ PbBr2(s)= 2AgBr(s) + Pb(No3)2(aq)


Theabove reaction is a displacement chemical reaction. It occurs becausethe aqueous silver nitrate (AgNo3)is more reactive than the lead bromide. In order to balance theequation, one needs to separate the reactants and the products intoseparate groups, which consists of the reaction elements (Lew25).

Second,the individual will then need to determine the valency value (numberof free atoms) in each element. Both silver and nitrogen (III) oxidecharge is one, so it can only lose a single atom during a reaction. During the reaction, the silver metal loses the nitrate acquires thebromide atom because it is more reactive than the nitrate. Since thebromide atom has a valence value of negative two (2), each atom bondswith two silver atoms. On the same note, one lead atom bonds with twonitrate ions (Lew25).

Insummary, the displacement reaction needs would require a couple ofsilver nitrate compound to react with one lead (II) bromide solute in order to yield a couple of silver bromide compound atoms and onelead nitrate compound (Lew26).


Lew,Kristi. ChemicalReactions.New York: Chelsea House Publishers, 2008. Internet resource.