Multiple Choice
Which of the following is the correct chemical formula for barium phosphate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for sodium carbonate?
A
NaCO3
B
Na2CO3
C
Na2CO2
D
NaCO2
Verified step by step guidance1
Identify the ions involved in sodium carbonate: sodium ion (Na\textsuperscript{+}) and carbonate ion (CO\textsubscript{3}\textsuperscript{2-}).
Determine the charges of each ion: sodium ion has a charge of +1, and carbonate ion has a charge of -2.
Balance the total positive and negative charges to make the compound electrically neutral. Since carbonate has a -2 charge, you need two sodium ions (each +1) to balance it.
Write the chemical formula by placing the number of each ion as subscripts: two sodium ions and one carbonate ion, resulting in Na\textsubscript{2}CO\textsubscript{3}.
Verify that the formula is neutral by checking that the total positive charge (+2 from 2 Na\textsuperscript{+}) equals the total negative charge (-2 from CO\textsubscript{3}\textsuperscript{2-}).
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