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2. Dry ice color show - Wikipedia

   en.wikipedia.org/wiki/Dry_ice_color_show

   The dry ice color show is usually performed in classrooms to demonstrate the properties of acids and bases, their effect on pH indicators, and the sublimation of dry ice. Setup is simple and generally involves only minor hazards, the main one being the low temperature of dry ice, which can cause frostbite upon skin contact.

3. 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]

4. 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]

5. Universal indicator - Wikipedia

   en.wikipedia.org/wiki/Universal_indicator

   Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic. The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment.

6. Amphoterism - Wikipedia

   en.wikipedia.org/wiki/Amphoterism

   Amphoteric is derived from the Greek word amphoteroi (ἀμφότεροι) meaning "both".Related words in acid-base chemistry are amphichromatic and amphichroic, both describing substances such as acid-base indicators which give one colour on reaction with an acid and another colour on reaction with a base.

7. Phenolphthalein - Wikipedia

   en.wikipedia.org/wiki/Phenolphthalein

   Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [citation needed] feh-NOL(F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations.

8. Anthocyanin - Wikipedia

   en.wikipedia.org/wiki/Anthocyanin

   The difference in chemical structure that occurs in response to changes in pH, is the reason why anthocyanins often are used as pH indicators, as they change from red in acids to blue in bases through a process called halochromism.

9. Base (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Base_(chemistry)

   A strong base is a basic chemical compound that can remove a proton (H +) from (or deprotonate) a molecule of even a very weak acid (such as water) in an acid–base reaction. Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH)