A strong acid, such as hydrochloric acid, at concentration 1 mol dm −3 has a pH of 0, while a strong alkali like sodium hydroxide, at the same concentration, has a pH of 14. Since pH is a logarithmic scale, a difference of one in pH is equivalent to a tenfold difference in …

2020年9月30日 · The pH scale shows how acidic or basic a chemical is in aqueous solution (mixed with water). The scale runs from 0 (most acidic) to 14 (most alkaline or basic), where 7 is neutral pH. Chemicals with pH values from 0 up to 7 are acids, those with a pH value of 7 are neutral, and those with pH values greater than 7 up to 14 are bases. Here is a ...

With this pH calculator, you can determine the pH of a solution in a few ways. It can convert pH to H + , as well as calculate pH from the ionization constant and concentration . The pH value is an essential factor in chemistry, medicine, and daily life.

pH is measured on a logarithmic scale. The formula for pH is. pH = – log 10 [H +] Where [H +] is the hydrogen ion concentration. The range of pH goes from 0 to 14. A value less than 7 indicates that water is acidic. A value greater than 7 indicates that water is alkaline. A value equal to 7 shows that water is neutral.

2023年1月30日 · The pH scale expands the division between zero and 1 in a linear scale or a compact scale into a large scale for comparison purposes. In mathematics, you learned that there are infinite values between 0 and 1, or between 0 and 0.1, or between 0 and 0.01 or between 0 and any small value.

2020年7月21日 · To calculate pH, first convert concentration to molarity. The easiest way to perform the calculation on a scientific calculator is to enter the hydrogen ion concentrations, press the log key (not the ln key, which is natural logarithm), and then take the negative of the value.

2024年12月10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。 “pH"中的“H"代表氢离子（H+），而"p"的来源则有多种说，引用化学界的概念是把p加在无量纲量前面表示该量的负对数。 什么是pH？ pH值其实是一个“对数单位”。 每个数字代表水的酸度10倍的变化。 水pH为5等于10倍具有pH为6的水的酸性。 在标准温度和压力下，pH=7的水溶液（如：纯水为中性，这是因为水在标准温度和压力下自然电离 …

Unless otherwise noted, references to pH values are presumed to be those at standard temperature (25 °C) (Table \(\PageIndex{1}\)). 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.

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. When the pH is exactly 7 that indicates that the substance is neutral. An acidic substance is anything that will give up a proton. A basic substance will accept a proton.

Acidity and alkalinity are measured with a logarithmic scale called pH. Here is why: a strongly acidic solution can have one hundred million million, or one hundred trillion (100,000,000,000,000) times more hydrogen ions than a strongly basic solution!