Here's why:

* Acidity is defined by the presence of H+ ions (protons) in a solution.

* The more H+ ions present, the higher the acidity.

* When you remove hydrogen from a molecule, you are essentially removing a proton (H+).

Therefore, removing hydrogen from a molecule will decrease the number of protons in the solution, resulting in a lower concentration of H+ ions. This means the solution becomes less acidic.

Example:

* Hydrochloric acid (HCl) is a strong acid because it readily donates a proton (H+) to form Cl-.

* If you remove the hydrogen from HCl, you get chlorine (Cl). Chlorine is not an acid because it doesn't have any protons to donate.

Important Note: The removal of hydrogen can also affect the overall structure and stability of the molecule, which can further influence its acidity.