Asample of pure water is neutral because it contains

A sample of pure water is neutral because it contains the same number of H₃O⁺ ions as OH⁻ ions

Explanation:

Neutral pH is 7.By definition pH = - log [H₃O⁺]Water ionizes according to this equilibrium equation:

        2 H₂O (l) ⇄ H₃O⁺ + OH⁺

So, the ionization (equlibrium) constant is:

        Kw = [H₃O⁺ ] [ OH⁺]

At 25°C, Kw = 1 × 10⁻¹⁴Hence: [H₃O⁺ ] [ OH⁺] =  [H₃O⁺ ] ² = 1 × 10⁻¹⁴ ⇒  [H₃O⁺ ] = 10⁻⁷⇒ pH = - log (10⁻⁷) = 7

The answer is letter c