When aqueous solutions of chromium(III) bromide and potassium phosphate are combined, solid chromium(III) phosphate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:

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  1. Write the molecular equation and balance it.
    CrBr3(aq) + K3PO4(aq) ==> CrPO4(s) + 3KBr(aq)

    Separate into the complete ionic equation. It should be obvious that the aq solutions ionize and the solid is shows as the molecule since it doesn't dissolve.
    Cr^3+(aq) + 3Br^-(aq) + 3K^+(aq) + PO4^3-(aq) ==> CrPO4(s) + 3K^+(aq) + 3Br^-(aq)

    Now look and cancel those ions common to both sides. I see thed 3Br^- on left and right and 3 K^+ left and right. Mark those off. What is left is the net ionic equation.

    Cr^3+(aq) + PO4^3-(aq) ==> CrPO4(s)

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