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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 ...
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]
Get the Moses Lake, WA local weather forecast by the hour and the next 10 days.
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
Texas Red or sulforhodamine 101 acid chloride is a red fluorescent dye, used in histology for staining cell specimens, for sorting cells with fluorescent-activated cell sorting machines, in fluorescence microscopy applications, and in immunohistochemistry. [1] [2] Texas Red fluoresces at about 615 nm, and the peak of its absorption spectrum is ...
Neutral red (toluylene red, Basic Red 5, or C.I. 50040) is a eurhodin dye used for staining in histology. It stains lysosomes red. [ 1 ] It is used as a general stain in histology, as a counterstain in combination with other dyes, and for many staining methods.
An estimated 25% of Texas grasslands are infested and 16 million acres (6.5 million hectares) are so invaded that it is suppressing the majority of grass production. [ 3 ] [ unbalanced opinion? ] [ neutrality is disputed ] In Mexico and the US, the two most problematic species are honey mesquite ( Neltuma glandulosa ) and velvet mesquite ...