pH 计算器
在 [H+]、pH、pH、pOH和[OH-]之间转换,并对酸性进行分类。
输入结果时更新 。
关于此计算器
The pH scale measures how acidic or basic a solution is, defined as the negative base-10 logarithm of the hydrogen-ion concentration: pH = −log₁₀[H⁺], where [H⁺] is in moles per litre. Because it is logarithmic, each whole pH unit is a tenfold change in acidity — a pH 4 solution has ten times the [H⁺] of pH 5 and a hundred times that of pH 6. The scale runs from strongly acidic near 0, through neutral at 7, to strongly basic near 14. This calculator converts a concentration to pH, a pH back to concentration, or starts from pOH.
As a worked example, pure water has [H⁺] = 1 × 10⁻⁷ mol/L, so pH = −log₁₀(10⁻⁷) = 7, which is neutral. A solution with [H⁺] = 10⁻³ mol/L has pH 3 and is acidic; one with pH 11 is strongly basic. The tool also returns pOH and the hydroxide concentration [OH⁻], using the water relationship pH + pOH = 14 at 25 °C — so pH 3 implies pOH 11 and [OH⁻] = 10⁻¹¹ mol/L — and labels the result acidic, neutral or basic.
pH governs a huge range of everyday and industrial processes: the safety of drinking water and swimming pools, soil conditions for gardening, food preservation and brewing, the action of enzymes in the body (blood is tightly held near pH 7.4), and countless chemistry and biology experiments. Note that the 14-point span and the pH + pOH = 14 rule are specific to 25 °C; at other temperatures the neutral point and the sum shift slightly because water’s self-ionisation changes.
经常问到的问题
PH公式是什么?
pH是氢离子浓度的负基-10对数,pH =-log10[H+]。浓度为1x10-7 mol/L,中性pH为7。
PH和POH之间有什么关系?
在25°C时,pH+pOH=14。 所以pH3的溶液有pHO11, 其氢氧化物浓度为[OH-]=10-11 mol/L。
PH比例是什么意思?
7 下方为酸性, 完全中性, 7 下方为中性, 高于7 是基本( 碱性 ) 。 比例通常为 0-14, 尽管强酸或基底可能略微下跌到它之外。 计算器将您的价值分为酸性、 中性或基本值。
PH 对数为何是?
氢离子浓度跨越多个数量级, 所以日志比例可以控制数量。 每个单位变化十倍: pH 4 酸比 pH 5 和 pH 6 的十倍。
我如何从 pH 值中找到 [H+]?
倒转定义 : [H+] = 10(- pH). pH 3 表示 [H+] = 10- 3 = 0.001 mol/L. 选择“从 pH 值中” 模式,计算器返回您集中的值 。
温度是否会改变pH值?
是。中点为 7, pH+pOH = 14 规则,在 25 °C 时保持;在高温水离子增加时,中点为 7, 中点为 7, 相向值稍有下降。此工具使用标准值为 25 °C。
API - 使用代码中的计算器
将此计算器称为自由 JSON 端点 。 不需要按键 。 将字段值发送到下面作为查询参数或 JSON 。 任何您省略的, 都会使用相同的默认值, 此页面预填的默认值是预填的; 未知参数是 400, 而不是静音零 。 读取 API 全部文件 →
终点
GET https://calculator.free/api/v1/ph/curl
curl "https://calculator.free/api/v1/ph/?mode=conc&conc=1e-07&phval=7"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/ph/?" + new URLSearchParams({
"mode": "conc",
"conc": "0.0000001",
"phval": "7"
}));
const data = await r.json();
console.log(data.results);成果仅是一般指导的估计数,而不是财务、医疗或税务咨询。