Which is not either an Arrhenius acid or base?

Question

1. HCO3 (-)

2. NaOH

3. HIO4

4. NH3

what are the products of 2-4 when they are in water?

Answer 1

4. NH3

An Arrhenius acid must contain a hydrogen cation (H) and an Arrhenius base must contain the hydroxide anion (OH). NH3, ammonia, is considered to be a Bronsted-Lowry base.

In water:

2. NaOH + H2O --> Na(+)  + H2O + OH(-)

3. HIO4 + H2O --> IO4 + H3O(+)

4. NH3 + H2O --> NH4 + OH(-)

Charges are written in parentheses to avoid confusion.