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Name C.I.-Name Structure CAS number Indicator properties Other uses Tropaeolin O (Resorcingelb) Acid Orange 6. Food Yellow 8 547-57-9 pH 11.1–12.7 yellow/brown Tropaeolin OO (Orange IV) Acid Orange 5: 554-73-4 pH 1.2–3.2 violet-red/yellow Dye for wool Tropaeolin OOO1 (Orange I) Acid Orange 20: 523-44-4 pH 7.6–8.9 yellow/pink Tropaeolin OOO2
pH indicators: a graphic view. 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 ...
Because it changes color at the pK a of a mid strength acid, it is usually used in titration of strong acids in weak bases that reach the equivalence point at a pH of 3.1-4.4. [3] Unlike a universal indicator, methyl orange does not have a full spectrum of color change, but it has a sharp end point. In a solution becoming less acidic, methyl ...
Titration indicator table [11] Indicator name Indicator colour Transition interval (pH range) Color after high pH conditions Methyl Orange Orange/red 3.1 - 4.4 Yellow Methyl Red Red 4.4 - 6.3 Yellow Congo Red Blue 3.0 - 5.2 Red Phenolphthalein Colourless 8.3 - 10.0 Pink Thymolphthalein Colourless 9.3 - 10.5 Blue Bromophenol Blue Yellow 3.0 - 4.6
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A roll of universal indicator pape Colors of universal indicator. A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution ...
No description. Template parameters [Edit template data] This template prefers block formatting of parameters. Parameter Description Type Status indicator_name indicator_name no description Unknown optional low_pH low_pH no description Unknown optional high_pH high_pH no description Unknown optional low_pH_color low_pH_color no description Unknown optional low_pH_text low_pH_text no ...
Acid orange 5 is a compound with formula Na(C 6 H 5 NHC 6 H 4 N=NC 6 H 4 SO 3). It is an azo dye . It is also used as a pH indicator ; it is red in pH under 1.4, orange-yellow in pH over 3.2.
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