Multiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between Ca^{2+} and PO_4^{3-} ions?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct chemical formula for ammonium phosphide?
A
NH4)2PO3
B
NH4)3P
C
NH4)2P
D
NH4)3PO4
Verified step by step guidance1
Identify the ions involved in ammonium phosphide: ammonium ion is \(\mathrm{NH_4^+}\) and phosphide ion is \(\mathrm{P^{3-}}\).
Determine the charges on each ion: ammonium has a charge of +1, and phosphide has a charge of -3.
Balance the total positive and negative charges to make the compound neutral. Since phosphide has a charge of -3, you need three ammonium ions to balance it out.
Write the formula by placing the ammonium ion in parentheses with a subscript of 3, followed by the phosphide ion: \(\mathrm{(NH_4)_3P}\).
Verify that the total positive charge (+3 from three \(\mathrm{NH_4^+}\) ions) balances the total negative charge (-3 from one \(\mathrm{P^{3-}}\) ion), confirming the formula is electrically neutral.
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