pH indicator

Absorption spectra of bromocresol green at different stages of protonation

A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H₃O) or hydrogen ions (H) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0. Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic (alkaline). As most naturally occurring organic compounds are weak protolytes, carboxylic acids and amines, pH indicators find many applications in biology and analytical chemistry. Moreover, pH indicators form one of the three main types of indicator compounds used in chemical analysis. For the quantitative analysis of metal cations, the use of complexometric indicators is preferred, whereas the third compound class, the redox indicators, are used in titrations involving a redox reaction as the basis of the analysis.

单词	PH Indicators
释义	PH Indicators 原声例句 Crash Course 综合篇 Litmus is a pH indicator, a chemical that turns different colors at different pHs. 只有极少量的水分子分解成了离子。 Crash Course 综合篇 Earlier I used a pH indicator that showed an acidic pH by turning pink. 早些时候，我使用了一种 pH 指示剂，它通过变成粉红色来显示酸性 pH 值。化学 Crash Course And we determine it in the lab using pH indicators through a process called titration. 我们在实验室中通过称为滴定的过程使用 pH 指示剂来确定它。 Crash Course 综合篇 It's actually a mix of two different pH indicators: bromocresol green and methyl red. 它实际上是两种不同 pH 指示剂的混合物：溴甲酚绿和甲基红。 Crash Course 综合篇 Here we have 100 mL of water from the river to which I've added some pH indicator. 这里有 100 毫升的河水，我在其中添加了一些 pH 指示剂。 Crash Course 综合篇 We call that threshold the buffering capacity of the solution. And we determine it in the lab using pH indicators through a process called titration. 我们将该阈值称为解决方案的缓冲能力。我们在实验室中通过称为滴定的过程使用 pH 指示剂来确定它。化学 Crash Course And this is just distilled water with a pH indicator in it that makes it blue when it's neutral or basic and it'll turn pink if it's at least a little bit acidic. 这只是蒸馏水，里面有 pH 指示剂，当它呈中性或碱性时，它会变成蓝色，如果它至少有点酸性，它会变成粉红色。英语百科 pH indicator A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H₃O) or hydrogen ions (H) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0. Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic (alkaline). As most naturally occurring organic compounds are weak protolytes, carboxylic acids and amines, pH indicators find many applications in biology and analytical chemistry. Moreover, pH indicators form one of the three main types of indicator compounds used in chemical analysis. For the quantitative analysis of metal cations, the use of complexometric indicators is preferred, whereas the third compound class, the redox indicators, are used in titrations involving a redox reaction as the basis of the analysis.
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PH Indicators

pH indicator