what is the net ionic equation for  Pb(NO3)2 + K3PO4 => KNO3 + Pb3(PO4)2

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This is not a reaction with change in oxidation states. 

Here from `Pb^(2+)` and `PO_4^(3-)` it forms `Pb_3(PO_4)_2` precipitate. So only that will take part in the net ionic reaction. All others are cancel out.

So the net ionic equation will be;

`3Pb^(2+)_(aq)+2PO_4^(3-)_(aq) rarr Pb_3(PO_4)_2_(s)`

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This is not a reaction with change in oxidation states. 

Here from `Pb^(2+)` and `PO_4^(3-)` it forms `Pb_3(PO_4)_2` precipitate. So only that will take part in the net ionic reaction. All others are cancel out.

So the net ionic equation will be;

`3Pb^(2+)_(aq)+2PO_4^(3-)_(aq) rarr Pb_3(PO_4)_2_(s)`


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