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⚡ 离子强度计算器Ionic Strength Calculator
I = 1/2 Sum c_i z_i^2。每行填写：浓度(mol/L) 与电荷数 z。本地处理。I = 1/2 Sum c_i z_i^2. Each line: concentration (mol/L) and charge z. Processed locally.
使用说明与常见问题How-to & FAQ
「离子强度计算器」是什么？What is the Ionic Strength Calculator tool?
I = 1/2 Sum c_i z_i^2。每行填写：浓度(mol/L) 与电荷数 z。本地处理。I = 1/2 Sum c_i z_i^2. Each line: concentration (mol/L) and charge z. Processed locally.
如何使用「离子强度计算器」？How do I use the Ionic Strength Calculator tool?
在「离子强度计算器」中，填写上方字段等参数，结果会随输入实时计算并显示在下方。In the Ionic Strength Calculator: Fill in the fields above; results are recalculated instantly as you type.
能算活度系数吗？Does it give activity coefficients?
不能，本页只算离子强度 I = ½ Σ cᵢzᵢ²（每行填浓度和电荷）。活度系数可以再用德拜-休克尔方程由 I 估算，例如稀溶液中 log γ ≈ −0.51 z² √I（25 °C 水溶液）。No, it only computes ionic strength I = ½ Σ cᵢzᵢ² (one line per ion: concentration and charge). Activity coefficients can then be estimated from I with Debye–Hückel, for example log γ ≈ −0.51 z² √I in dilute water at 25 °C.
可以用逗号吗？Are commas allowed?
不可以。每行两个数用空格分开，小数用点（0.1）；逗号会与千位分隔或欧洲小数写法混淆，因此直接提示，不会静默拆成错误结果。No. Put two numbers per line separated by a space, with a point for decimals (0.1). Commas are ambiguous with thousands separators or European decimals, so the page rejects them instead of silently splitting into a wrong result.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「离子强度计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Ionic Strength Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「离子强度计算器」免费吗？需要注册吗？Is the Ionic Strength Calculator free? Do I need an account?
「离子强度计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Ionic Strength Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.