🧪 氢离子浓度 / pH 计算器Hydrogen Ion Concentration / pH Calculator

使用说明与常见问题How-to & FAQ

「氢离子浓度 / pH 计算器」是什么？What is the Hydrogen Ion Concentration / pH Calculator tool?

由 pH 求 [H+]=10^(-pH)（并示意 25C 的 [OH-]），或由 [H+] 求 pH。本地处理。可设置「已知」、「pH」、「[H⁺] mol/L」。From pH get [H+]=10^(-pH) (with a 25C [OH-] demo), or from [H+] get pH. Processed locally. Settings: Known, pH, [H⁺] mol/L.

如何使用「氢离子浓度 / pH 计算器」？How do I use the Hydrogen Ion Concentration / pH Calculator tool?

在「氢离子浓度 / pH 计算器」中，填写「已知」、「pH」、「[H⁺] mol/L」等参数，结果会随输入实时计算并显示在下方。In the Hydrogen Ion Concentration / pH Calculator: Fill in "Known", "pH", "[H⁺] mol/L"; results are recalculated instantly as you type.

温度会影响结果吗？Does temperature matter?

[H⁺] = 10^(−pH) 本身与温度无关。但页面涉及的 Kw ≈ 1 × 10⁻¹⁴（中性 pH 7）只在 25 °C 成立；温度升高时 Kw 变大，中性点的 pH 会低于 7。[H⁺] = 10^(−pH) itself does not depend on temperature, but the Kw ≈ 1 × 10⁻¹⁴ (neutral pH 7) used on the page holds at 25 °C. At higher temperatures Kw is larger and neutral pH drops below 7.

能举个计算实例吗？Can you show a worked example?

例如在「氢离子浓度 / pH 计算器」中填 已知 = 由 pH 求浓度，pH = 7，结果区显示：[H⁺] mol/L：1.0000e-7；[OH⁻] 示意（25°C）：1.0000e-7For example, entering Known = From pH, pH = 7 in the Hydrogen Ion Concentration / pH Calculator gives: [H⁺] mol/L: 1.0000e-7; [OH⁻] demo (25°C): 1.0000e-7

哪些输入会被检查？Which inputs are validated?

「氢离子浓度 / pH 计算器」会检查这些输入——「pH」：所选方式用到时必须填写；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Hydrogen Ion Concentration / pH Calculator checks its inputs — "pH": required when the chosen option uses it; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「氢离子浓度 / pH 计算器」的设置：「已知」可选 由 pH 求浓度 From pH、由浓度求（默认 由 pH 求浓度 From pH）；「pH」默认 7；「[H⁺] mol/L」默认 1e-7。每次生成结果都按当前设置处理。Settings in the Hydrogen Ion Concentration / pH Calculator — "Known": 2 choices; "pH" default 7; "[H⁺] mol/L" default 1e-7. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「氢离子浓度 / pH 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 Hydrogen Ion Concentration / pH 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.

「氢离子浓度 / pH 计算器」免费吗？需要注册吗？Is the Hydrogen Ion Concentration / pH Calculator free? Do I need an account?

「氢离子浓度 / pH 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 Hydrogen Ion Concentration / pH 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.