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2. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   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 ...

3. Tropaeolin - Wikipedia

   en.wikipedia.org/wiki/Tropaeolin

   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

4. Category:pH indicators - Wikipedia

   en.wikipedia.org/wiki/Category: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

5. Universal indicator - Wikipedia

   en.wikipedia.org/wiki/Universal_indicator

   A roll of universal indicator paper 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 ...

6. Methyl orange - Wikipedia

   en.wikipedia.org/wiki/Methyl_orange

   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 ...

7. List of dyes - Wikipedia

   en.wikipedia.org/wiki/List_of_dyes

   Common name Synonyms C.I. generic name C.I. number Class CAS number Acid Black 52 Acid Black 52 15711 azo 5610-64-0: Acid Blue AS Weak Acid Blue Acid Blue 25: 62055 anthraquinone: 6408-78-2: Acid fuchsin: Acid Magenta Acid Rubin Acid Violet 19 42685 triarylmethane: 3244-88-0: Acid orange 3 Acid orange 3 10385 nitro 6373-74-6: Acid orange 19 ...

8. List of reagent testing color charts - Wikipedia

   en.wikipedia.org/wiki/List_of_reagent_testing...

   It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]

9. Acid orange 5 - Wikipedia

   en.wikipedia.org/wiki/Acid_orange_5

   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.