January 2018 NY Regents Chemistry Exam
24 Which substance is an Arrhenius acid? (1) HBr
(2) NaBr
(3) NaOH
(4) NH3
Solution: The definition of an Arrhenius acid is that it gives off H+ ions when dissolved in water. This eliminates choice 2 since it does not have any hydrogens. Table L lists common bases. NH3 and NaOH are listed in Table L and can be eliminated as well. Finally, we can also look at Table K on the Reference Table for the common acids as well. HCl is listed in Table K. HBr is an Arrhenius acid similarly to HCl.
Answer: 1
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