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Net Ionic Equations

AP Chemistry· difficulty 1/5

Aqueous Pb(NO3)2 is mixed with aqueous KI to form a yellow precipitate; the spectator ions K+ and NO3- are highlighted.

Pb(NO3)2 + 2 KI -> PbI2(s) + 2 KNO3 spectators K+(aq), NO3-(aq) Net ionic: ?

The correct net ionic equation is:

  • A

    Pb(NO3)2 + 2 KI -> PbI2 + 2 KNO3

  • B

    Pb2+(aq) + 2 I-(aq) -> PbI2(s)

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  • C

    Pb2+ + I- -> PbI

  • D

    K+ + NO3- -> KNO3

Explanation

Removing K+ and NO3- spectator ions leaves the species that actually combine: Pb2+ and 2 I- forming PbI2(s).

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