Question

Which ion(s) would NOT be spectator ions when aqueous solutions of lead(II) nitrate and potassium iodide are combined? Select all that apply. Group of answer choices Pb2+ NO3- K+ I- there is no reaction

Answer 1

molecular equation Pb(NO3)2(aq) + 2Kl(aq) ----> Pb12(s) + 2KNO3(aq) In aqueous solutions (aq) the compounds are all dissociated into their constituent ions. The Complete ionic equation shows all the ions present in solution separately. Pb2+(aq) + 2NO3(-)(aq) + 2K+(aq) + 21-(aq) --> Pb12(s) + 2K+(aq) + 2NO3(-)(aq) When you look at the above equation you can see that the 2NO3(-)(aq) and the 2K+(aq) are the same on both sides of the equation. This means they are not participating in the reaction, they are spectator ions. The ionic equation shows only those species in a reaction that are actually reacting. The spectator ions are left out. ionic equation Pb2+(aq) + 21-(aq) = Pb12(s)