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词汇 Bromthymol
分类 英语词汇 英语翻译词典
释义

Bromthymol

中文百科

溴百里酚蓝 Bromothymol blue

(重定向自Bromthymol)
BTB指示剂在酸性、中性和碱性溶液中的颜色(从左至右)
溴百里酚蓝在不同pH值时的结构

溴百里酚蓝(中文译名颇多:溴瑞香草蓝、溴瑞香草酚蓝、溴化麝香草酚蓝、溴麝香草酚兰、溴麝香草酚蓝、溴芮香草蓝、溴百里酚蓝指示剂,又名酒精­蓝色指示剂)是测定弱酸弱碱时使用的一种指示剂,其酸性时为黄色,碱性时为蓝色。

其酸碱平衡为:

C27H28Br2O5S H + C27H27Br2O5S

溴百里酚蓝的pKa为7.10。

英语百科

Bromothymol blue 溴百里酚蓝

(重定向自Bromthymol)
Structure at different pH ranges
The different colors of bromothymol blue. From left to right: blank, pH 4, 6.2, 6.6, 7.2,  7.5, 8, and 12

Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid. It is typically sold in solid form as the sodium salt of the acid indicator.

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