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Which of the following is the correct chemical formula for the ionic compound formed between NH_4^+ and PO_4^{3-}?
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3. Chemical Reactions
Writing Ionic Compounds
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Which of the following is the correct chemical formula for the ionic compound formed between Au^{3+} and HSO_4^{-}?
A
Au_2(HSO_4)_3
B
AuHSO_4
C
Au(HSO_4)_3
D
Au_3(HSO_4)_2
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Identify the charges of the ions involved: Au^{3+} has a charge of +3, and HSO_4^{-} has a charge of -1.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since Au^{3+} has a +3 charge and HSO_4^{-} has a -1 charge, you need three HSO_4^{-} ions to balance one Au^{3+} ion.
Write the chemical formula by placing the Au ion first, followed by the HSO_4 ion with a subscript of 3 to indicate three of these ions: Au(HSO_4)_3.
Verify that the total positive charge (+3 from Au) equals the total negative charge (3 × -1 from HSO_4), confirming the compound is neutral.
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