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
### 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.
- Kw = [H⁺] × [OH⁻]
- Kw = (1.0 × 10⁻⁷)(1.0 × 10⁻⁷)
- Kw = 1.0 × 10⁻¹⁴
- pKw = 14.0