What is the formula of the compound formed when ammonium ions, #NH_4 ^+#, and phosphate ions, #PO_4^(3-)# combine? Chemistry Ionic Bonds Covalent compounds 1 Answer Kevin L. Feb 26, 2017 #(NH_4)_3PO_4# Explanation: This is because #NH_4^(+)# has a charge of 1+, and #PO_4^(3-)# has a charge of 3-. The compound should have a neutral charge, so it takes three #NH_4^+# to balance out #PO_4^(3-)#. Answer link Related questions Question #c4f8c What is a covalent compound? What are some examples of covalent compounds? What is an example of a covalent compound practice problem? Is calcium sulfate an ionic or covalent compound? Why can covalent compounds conduct electricity? How do covalent compounds differ from ionic compounds? Why do covalent compounds follow the octet rule? What covalent compound is CO? What covalent compound is N2S? See all questions in Covalent compounds Impact of this question 25958 views around the world You can reuse this answer Creative Commons License