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Multiple Choice
Which of the following is the correct chemical formula for sodium phosphate?
A
Na3PO3
B
Na2PO4
C
Na3PO4
D
NaPO4
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1
Identify the ions involved: sodium ion (Na\(\textsuperscript{+}\)) and phosphate ion (PO\(\textsubscript{4}\)\(\textsuperscript{3-}\)).
Determine the charge on each ion: sodium ion has a charge of +1, and phosphate ion has a charge of -3.
Balance the total positive and negative charges to make a neutral compound. Since phosphate has a -3 charge, you need three sodium ions (each +1) to balance it.
Write the chemical formula by combining three sodium ions with one phosphate ion, resulting in Na\(\textsubscript{3}\)PO\(\textsubscript{4}\).
Verify that the formula is electrically neutral: (3 × +1) + (-3) = 0, confirming the correct formula is Na\(\textsubscript{3}\)PO\(\textsubscript{4}\).