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Due to a color change from blue to red at pH 3.0–5.2, Congo red can be used as a pH indicator.Since this color change is an approximate inverse of that of litmus, it can be used with litmus paper in a simple parlor trick: add a drop or two of Congo red to both an acid solution and a base solution.
In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...
This category contains articles about pH indicators: chemical compounds which change colour or fluorescence in response to changes in pH Wikimedia Commons has media related to PH indicators . Subcategories
Phenol red exists as a red crystal that is stable in air. Its solubility is 0.77 grams per liter (g/L) in water and 2.9 g/L in ethanol. [1] It is a weak acid with pK a = 8.00 at 20 °C (68 °F). A solution of phenol red is used as a pH indicator, often in cell culture.
The head of the International Committee of the Red Cross, known as the ICRC, said “all indicators are going through the roof” since Oct. 1 when fighting resumed between Congolese government ...
Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pK a of 5.1. [2]
Solvent red 80 12156 azo 6358-53-8: Congo corinth Erie garnet B Direct red 10 22145 diazo 2429-70-1: Congo red: Cotton red Direct red 28 22120 diazo 573-58-0: Coomassie brilliant blue: Brilliant blue R Acid blue 83 42660 triarylmethane 6104-59-2: Cotton scarlet Acid red 73 27290 diazo 5413-75-2: Coumarin 7 Disperse yellow 82 Solvent yellow 145
"A Bar Song (Tipsy)" is also up for best remixed recording, but that award would go to the remixer, David Guetta. Even outside the handful of nominations, the tune has made history on many fronts. ...