Multiple Choice
Which of the following is the correct chemical formula for the ionic compound barium iodide?
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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 sulfate?
A
NaSO3
B
NaSO4
C
Na2SO4
D
Na2SO3
Verified step by step guidance1
Identify the ions involved in sodium sulfate: sodium ion (Na\^+) and sulfate ion (SO\_4\^{2-}).
Recall the charges of each ion: sodium ion has a charge of +1, and sulfate ion has a charge of -2.
Determine the ratio of sodium ions to sulfate ions needed to balance the overall charge to zero. Since sulfate has a -2 charge, two sodium ions (each +1) are needed to balance it.
Write the chemical formula by combining two sodium ions with one sulfate ion, resulting in Na\_2SO\_4.
Verify that the formula is electrically neutral by checking that the total positive charge (+2) equals the total negative charge (-2).
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