In the reaction between NH4+ and NO3–, which of the following would be considered the base?

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Correct Answer: A. NO3–
The base is a proton acceptor, and would therefore add a hydrogen to its chemical formula. Between the two compounds provided, NH4+ would behave as the acid, releasing hydrogen to get back to a zero charge and NO3– would behave as the base accepting the hydrogen to return to its neutral state of HNO3.
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