Predict products for the following chemical reactions. Write molecular equations and balance them. Write total ionic equations and net ionic equations. Insoluble substances, non-electrolytes, and weak electrolytes remain in molecular form when writing ionic equations. Note especially that care must be taken in determining the ionic composition of compounds. For example, sodium phosphate (Na3PO4) forms ions in solution to produce three Na+ ions and one PO43– ion. It does not produce an ion with this formula: Na3+.