How to Write the Formula for Iron (II) phosphate

In this video we'll write the correct formula for Iron (II) phosphate, FePO4.

To write the formula for Iron (II) phosphate we’ll use the Periodic Table, a Common Ion Table, and follow some simple rules.

Because Iron (II) phosphate has a polyatomic ion (the group of non-metals after the metal) we’ll need to use a table of names for common polyatomic ions, in addition to the Periodic Table.

---Keys for Writing Formulas for Compounds with Transition Metals---

1. Write the symbol and charge for the transition metal. The charge is the Roman Numeral in parentheses.
2. Write the symbol and charge for the non-metal. If you have a polyatomic ion, use the Common Ion table to find the formula and charge.
3. See if the charges are balanced (if they are you’re done!)
4. Add subscripts (if necessary) so the charge for the entire compound is zero.
5. Use the crisscross method to check your work.

Notes:
- Don’t write the subscript '1'.
- If you use the criss-cross method and end up with something like Ca2S2 you'll need to reduce the subscripts to Ca1S1 which we write CaS.
- It is possible to have two polyatomic ions such as NH4NO3. In this case find and write both names as found on the Common Ion Table.
For a complete tutorial on naming and formula writing for compounds, like Iron (III) phosphate and more, visit:

Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).

[carminevillarreal]

thank you so much, this is very helplful and i appreciate your videos

[sarswatimulawakar]

What is the electronic configuration of iron🤔🤔

[jkid]

Help me guysss.Iron(II) phosphate is found in the hydrated form in the mineral Vivianite. What is the formula for this compound? I know it is Fe3(PO4)2 x 8H2O but i dont know where that 8H2O came from

[proteinpowderisyummy]

This is for Iron (II)... not Iron (III)