Question

What is the conjugate acid for H2O (water)?

Answer 1

`hydronium` `ion, H_3O`

Explanation:

As a general rule "rough method" , add a proton (H) to make conjugate acid. Remove a proton to make a conjugate base.
In water `H_2O` adding a proton gives you the `hydronium` `ion H_3O`

Answer 2

The conjugate acid is simply the original species PLUS a proton, `H^+`. The conjugate base is simply the original species LESS a proton, `H^+`.

Explanation:

In both instances, mass and charge are conserved. If we add a proton to water we get `H_3O^+`, the hydronium ion, which is an hypothetical species but is nevertheless useful for acid/base calculations.

Given this, you know that the conjugate base for water is `OH^-`, the hydroxide ion, and its conjugate acid is the hydronium ion, `H_3O^+`. Can you tell me the conjugate base for sulfuric acid, bisulfate ion, and hydroxide ion? Please give the answers in this thread.