| Customization: | Available |
|---|---|
| CAS No.: | 1393-92-6 |
| Formula: | (C7h7o4n)N |
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| Name | Litmus |
| Synonyms | Lacca coerulea; Lacca musica; Lacmus; Lichen blue; Litmus indicator; Litmus paper; Turnsole |
| CAS Registry Number | 1393-92-6 |
| EINECS | 215-739-6 |
In acidic solutions, molecules are the main form of its existence, giving the solution its red color; (Due to the increase of [H+], the equilibrium shifts to the left) In the alkaline solution, the ionization equilibrium caused by litmus ionization moves to the right, and the acid ion generated by ionization is the main form of its existence, so the solution is blue; (As [OH-] increases, the equilibrium shifts to the right) In a neutral solution, molecules and acid ions coexist, so the solution is purple, that is, it does not change color. ([HZ]=[Z-]) Acid: red pH≤4.5 Weak acid, neutral, weak base: no discoloration 4.5<pH≤8.3 Alkali: blue pH>8.3 All the phenomena that make the acid-base indicator discoloration are chemical changes.
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