When,
[OH⁻] = 1.4 × 10⁻³
Then,
pOH = -log (1.4 × 10⁻³)
pOH = 2.85
Also,
pH + pOH = 14
So,
pH = 14 - 2.85
pH = 11.15
As pH is greater than 7, so the solution is Basic in Nature.
Calculating for concentration of [H⁺],
As,
pH = -log [H⁺]
Or,
11.15 = -log [H⁺]
Taking Antilog on both sides,
[H⁺] = 7.07 × 10⁻¹² M
Result:
A solution with a hydroxide ion concentration of 4.15 × 10⁻³ M is Basic and has a hydrogen ion concentration of 7.07 × 10⁻¹² M.