Question

Write the correct formula for the ionic compound, sodium phosphate. The phosphate ion is a polyatomic...

Write the correct formula for the ionic compound, sodium phosphate. The phosphate ion is a polyatomic anion with the formula (PO43-)

A. Na(PO4)3

B. NaPO4

C. Na2(PO4)3

D. Na3(PO4)2

E. Na3PO4

Can you explain why which answer is correct? I'm very unsure.

Homework Answers

Answer #1

The correct formula is Na3PO4 . option E is correct.

In writing ionic formulae we have to balance the charge of ions in order to get a neutral compound.

Here, the anion is PO43- . The charge of anion is -3 so the charge of cation should be +3. Then only both get cancelled and produce a neutral compound.

Here, the cation is Na. The charge of Na is +1. So we have to take 3 Na+ ions to get +3 charge.

Finally, the cation is 3 Na+ and anion is PO43- .

So the formula of ionic compound is Na3PO4

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