The diphosphate ion is a biologically important polyatomic ion. if the ionic compound calcium diphosphate has the formula ca2p2o7, which correctly represents the ion symbol of the diphosphate ion?

The symbols of the diphosphate ion is P₂O₇⁴⁻

Explanation:

The compound Ca₂P₂O₇ is known as Calcium pyrophosphate. for the compound to be formed, two ions are put together. The cation Ca²⁺ and the anion P₂O₇⁴⁻. The oxidation state of calcium is always +2. The anion has to have a charge of -4 to make the formula Ca₂P₂O₇.

 symbol                  Ca                  P₂O₇

oxidation state       +2                   -4

 valency                   2                     4

       Crossing the valency and finding the ratio of the valency after crossing

                                      = Ca₄ (P₂O₇)₂  

                                      = Ca₂P₂O₇          

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