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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.
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 or spectroscopically by changes in absorption and/or emission properties. [1] Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...
Low pH colour Transition pH range High pH colour Thymol blue (first transition) Red 1.2 – 2.8 Yellow Methyl orange: Red 3.2 – 4.4 Yellow Methyl red: Red 4.8 – 6.0 Yellow Bromothymol blue: Yellow 6.0 – 7.6 Blue Thymol blue (second transition) Yellow 8.0 – 9.6 Blue Phenolphthalein: Colourless 8.3 – 10.0 Fuchsia
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The degree of rotation of the compensator determines the range to the target by simple triangulation. [1] Coincidence rangefinders made by Barr and Stroud used two eyepieces, and may be confused with stereoscopic units. The second eyepiece showed the operator a range scale so the user could range and read the range scale simultaneously. [2] [3]
Cresol red (full name: o-cresolsulfonephthalein) [1] is a triarylmethane dye frequently used for monitoring the pH in aquaria. Cresol red ( pH indicator ) below pH 7.2
At equivalence point (pH 5.2): grey In bases : green Methylene blue functions to change the red-yellow shift of methyl red to a more distinct violet-green shift.
Quinaldine red is an indicator that turns from colorless to red between a pH of 1.0–2.2. [5] The image below shows what color quinaldine red would appear as in a given pH. Color change of Quinaldine red in pH change. It is a cationic molecule that undergoes oxidation at different levels of pH. [3]