水的离子积计算器 — 公式

Ion Product of Water

Formula

Kw = [H⁺] × [OH⁻]

At 25°C, Kw = 1.0 × 10⁻¹⁴, meaning:

  • In pure water, [H⁺] = [OH⁻] = 1.0 × 10⁻⁷ M
  • If [H⁺] increases, [OH⁻] decreases proportionally
  • pKw = pH + pOH = 14 at 25°C

    • 计算示例

    Pure water at 25°C has [H⁺] = 1.0 × 10⁻⁷ M and [OH⁻] = 1.0 × 10⁻⁷ M.

    1. Kw = [H⁺] × [OH⁻]
    2. Kw = (1.0 × 10⁻⁷)(1.0 × 10⁻⁷)
    3. Kw = 1.0 × 10⁻¹⁴
    4. pKw = 14.0