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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?

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Answer:

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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