Pt: What type of reaction has occurred in the following equation? 2 Na, PO, + 3 CaCl, 6 NaCl + Caz(PO.)2

Double replacement or double decomposition

Explanation:

In the reaction below, a double replacement or double decomposition has occurred.

          2Na₃PO₄   +   3CaCl₂   →  6NaCl  +  Ca₃(PO₄)₂

This reaction occurs mainly between two ionic substances.

The reaction involves an actual exchange of partners to form new compounds. For example;

             AB  + CD →  AD + CB

One of the following conditions below serves as the driving force for double replacement reactions:

4d^55s^1 ( third choice)