Which of the following statements is false? when the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases. when acids and bases are mixed, they react with each other to form water and a salt. the ph of blood is slightly basic. the more hydrogen ions in a solution, the more acidic the solution?

False statement: when the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases

Explanation:

As per the Sorensen pH scale, lesser the pH more the acidic character of the solution.

the pH is calculated as:

pH = -log[H⁺]

so more the [H⁺] concentration, lesser the pH, more the acidic solution.

The concentration of hydrogen ion and hydroxyl  ion is same in a neutral solution.

With the increase in concentration of hydrogen ion the concentration of hydroxyl ion decreases as

[H⁺][OH⁻]=10⁻¹⁴, at 25 °C

So the false statement is when the hydrogen ion concentration decreases, the hydroxyl ion concentration also decreases.

It is true that acid and bases reacts to form water and salt.

The example would be:

The pH of blood is near 7.4

if you mean hydrogen and oxygen then water is the product