pKb计算器
计算碱的pKb值，衡量碱的强度。
pKb
4.74
公式
## How to Calculate pKb ### Formula **pKb = −log₁₀(Kb)** Where: - **pKb** = negative base-10 logarithm of Kb - **Kb** = base dissociation constant A lower pKb indicates a stronger base. pKa + pKb = 14 at 25°C for a conjugate pair.
计算示例
Ammonia has Kb = 1.8 × 10⁻⁵.
- 01pKb = -log₁₀(Kb)
- 02pKb = -log₁₀(1.8 × 10⁻⁵)
- 03pKb = 4.74
常见问题
What does pKb tell you?
pKb measures base strength on a logarithmic scale. Lower pKb means stronger base. Each unit decrease represents a 10-fold increase in base strength.
How are pKa and pKb related?
For a conjugate acid-base pair at 25°C, pKa + pKb = 14. This comes from Ka × Kb = Kw = 10⁻¹⁴.
How do I convert pKb back to Kb?
Kb = 10^(-pKb). For example, pKb = 4.74 gives Kb = 10^(-4.74) = 1.82 × 10⁻⁵.
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