
酸堿指示劑
A brown or metallic green dye, C20H 12o 7, used as a pH indicator and in dyeing textiles.
一種棕色或金屬綠色染料,C20 H 12o 7,用作酸堿指示劑和用于給絲織物染色。
It USES distilled water and alcohol to refine water soluble acid and alkali of sample and then test the extractive with PH indicator.
用蒸餾水*********水溶液抽提試樣中的水溶性酸或堿,然後用酸度計或指示劑對抽提物進行測定。
Tianda Company manufactures primarily pH indicator and conductivity meter, and gained the manufacture permit several years ago, with excellent quality and is worthy of trust.
本公司主要生産酸度計、電導率儀等計量儀器,取得了生産許可證多年,産品卓越、信譽可靠。
Taking alcoholicity as the indicator, the effects of initial sugar content, initial pH, inoculum size and temperature on the fermentation of the wine were investigated.
以酒精度為指标,研究了初始糖度、初始酸度、接種量和發酵溫度對涼薯果酒發酵的影響;
A method of abstracting plant pigment as alternate indicator was described, and the change of colour at different pH ranges in various plant pigmentes was measured.
本文綜述了黑色素的理化性質和生理功能,以及林木植物黑色素的分離制取方法,并就黑色素的研究和應用進行了展望。
PH indicator(pH指示劑)是一種通過顔色變化來顯示溶液酸堿度(pH值)的化學物質。它通常是弱有機酸或弱有機堿,其分子結構在特定pH環境下發生改變,導緻吸收光譜變化,從而呈現肉眼可辨的顔色差異。
核心原理: 指示劑的酸式形态(HIn)和堿式形态(In⁻)具有不同的顔色。當溶液pH值變化時,指示劑的電離平衡發生移動: $$ce{HIn <=> H+ + In^-}$$ 根據勒夏特列原理,酸性環境(高[H⁺])促使平衡左移,主要呈現酸式色;堿性環境(低[H⁺])促使平衡右移,主要呈現堿式色。每種指示劑有其特定的變色範圍(pH過渡區間),通常在pKa值(酸解離常數)±1的範圍内。
關鍵特性:
常見應用:
權威參考來源:
PH indicator(pH指示劑)是用于檢測溶液酸堿度的化學物質。以下是詳細解釋:
PH指示劑屬于halochromic化合物(顯色化合物),其分子結構在不同pH環境下會改變,導緻顔色差異。例如:
PH指示劑的靈敏度較高,但僅能提供定性或半定量結果。精确測量需使用pH計(pH meter)。
如需進一步了解具體指示劑的變色範圍或化學結構,可參考化學實驗手冊或專業文獻。
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