In chemistry, pH (/ p iː ˈ eɪ tʃ / pee-AYCH), also referred to as acidity or basicity, historically denotes "potential of hydrogen" (or "power of hydrogen"). [1] It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions.

2018年2月10日 · pH is defined as the decimal logarithm of the reciprocal of the hydrogen ion activity, aH+, in a solution. For example, a solution with a hydrogen ion activity of 5×10−6 = 1/ (2×105) (at that level essentially the number of moles of hydrogen ions per liter of solution) has a pH of log10 (2×105) = 5.3.

2014年4月18日 · pH = − logaHX+ , pH = − log a H X + , and the activity is a dimensionless quantity. You can think of the activity as a generalization of the mole fraction that takes into account deviations from the ideal behaviour in real solutions.

2025年2月3日 · pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the values of the concentration of the hydrogen ion —which ordinarily ranges between about 1 and 10 −14 gram-equivalents per litre—into numbers between 0 and 14.

2023年1月30日 · The pH scale is logarithmic, meaning that an increase or decrease of an integer value changes the concentration by a tenfold. For example, a pH of 3 is ten times more acidic than a pH of 4. Likewise, a pH of 3 is one hundred times more acidic than a pH of 5. Similarly a pH of 11 is ten times more basic than a pH of 10.

2022年12月17日 · The term “pH” stands for “potential of hydrogen,” and it is a unit of measurement for the concentration of hydrogen ions in a solution. The concept of pH was first introduced by the Danish chemist Søren Peder Lauritz …

pH is a measure of how basic or acidic a substance is. pH has a range of 0-14. A pH greater than 7 means the substance is basic. A pH less than 7 means the substance is acidic.

2023年12月2日 · pH值，亦称氢离子浓度指数、酸碱值，是溶液中氢离子活度的一种标度，也就是通常意义上溶液酸碱程度的衡量标准。 这个概念是1909年由丹麦生物化学家提出。

pH范围在0~14之间，只适用于稀溶液，氢离子浓度或氢氧根离子浓度大于1mol/L的溶液的酸碱度，直接用浓度表示。 酸碱性是物质在酸碱反应中呈现的特性，一般来说酸性物质可以使紫色石蕊试液变红，碱性物质可以使其变蓝，后来随着酸碱理论的发展，人们给出了 ...

数学上定义ph值为氢离子浓度的常用对数负值。 即： 原理：酸碱性越强，导电性越好。 判断溶液的酸碱性，最简单的方法就是利用酸碱指示剂，常用的酸碱指示剂有紫色石蕊指示剂和酚酞试液。 酸性溶液能使紫色石蕊指示剂变红色，但不会让酚酞试液变色碱性溶液能使紫色石蕊指示剂变蓝色，使酚酞试液变红色。 pH是没有 计量单位 的，不是任何一个单位都有计量单位，像pH、 化学平衡常数 、电离平衡常数都没有计量单位。 【或者说PH值的单位是1.】 PH值的单位是什么来 …