Ionic product of water and pOH (Kw = [H+][OH-]; pH + pOH = 14 at 25°C)
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Kw = [H+][OH-]; pH + pOH = 14 at 25°C
What each symbol means
| Symbol | What it stands for |
|---|---|
| K_w | 1.0×10⁻¹⁴ at 25 °C (pure water) |
| pOH | -log10[OH-] |
When to use this
25 °C reference; Kw increases with T; neutral water pH = 7.00 at 25 °C only.