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QUESTION

# What is the conjugate acid of ClO4-?

Here's how you go about acid/base chemistry

The Bronsted-Lowry definition of an acid is a proton donator and a base is a proton acceptor. A proton is synonymous to a H^+ ion, so acid/ base chemistry is all about the H^+.

We can observe that the ion you were given, ClO_4^_ has a one negative charge. meaning it has the capacity to accept on H^+.

Therefore, its conjugate acid is HClO_4. Notice the neutral charge and the presence of the H^+. That's the giveaway you're looking for.

Hope that helps!