Solvent water for the acids e.g. HCl, H2SO4, HNO3, etc. act as ____.

Solvent water for the acids such as HCl, H2SO4, HNO3, etc. acts as a base.

Here's why:

In the context of Bronsted-Lowry theory, a base is defined as a substance that can accept a proton (H+ ion). When an acid like HCl, H2SO4, or HNO3 is dissolved in water, the water molecules act as a base by accepting the protons from the acid. This results in the formation of hydronium ions (H3O+).

So, the step-by-step process is:

1. An acid (like HCl, H2SO4, HNO3) is added to water.
2. The water molecules accept a proton from the acid, acting as a base.
3. This results in the formation of hydronium ions (H3O+), indicating that the water has acted as a base.