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什么是pH值所谓pH值,是化学上一个术语,用来表示一种溶液酸碱浓度大小的数值;换句话说,即是用来表示氢离子([H~+])的浓度。例如氢离子浓度为十分之一标准当量即1/10N时,用pH来表示即为pH1,依此类推,1/100 N即pH 2,1/1000N即pH3,pH与N的数值是一个对数的关系。因为在应用化学上往往有用到很淡的氢离子浓度的时候,这里用N来表示是很不方便的,所以改用pH值来代替。如何测定pH值测定pH值有很多方法,有应用氧化还原的,(如pH测定仪器——pH meter)有用比色的,而以比色法较比价廉而方便。其原理大都是应用某种有机
What is the pH value? The so-called pH value is a chemical term used to indicate the value of a solution’s acid-base concentration; in other words, it is used to indicate the concentration of hydrogen ions ([H~+]). For example, when the hydrogen ion concentration is one tenth of a standard equivalent, that is, 1/10N, pH is expressed as pH1, and so on, 1/100N is pH 2, 1/1000N, ie, pH3, and the value of pH and N is a value. Logarithmic relationship. It is inconvenient to use N to represent the very light hydrogen ion concentration used in the application chemistry, so instead of using pH, use it instead. How to determine the pH There are many ways to determine the pH. There are useful redox, such as the pH meter, which is useful for colorimetric comparison, and the colorimetric method is cheaper and more convenient. The principle is mostly applied organic