Question

what is the source of Litmus??

Answer 1

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Litmus is a water soluble mixture of different dyes extracted from lichens.It is often absorbed with filter paper to produce one of the oldest forms of pH indicator , used to test materials for acidity.
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Answer 2

Answer:

• The old Norse term for "dye" or "color" is where the word "litmus" originates. Arnaldus de Villa Nova, a Spanish physician, used litmus for the first time in 1300. Some lichens were used to extract the blue dye starting in the 16th century, primarily in the Netherlands. A variety of lichen species contain litmus.
• Lecanora tartarea (Norway, Sweden), Variolaria dealbata, Ochrolechia parella, Parmotrema tinctorum, and Parmelia are some of the species from which the dyes are extracted. Other species include Roccella tinctoria (South America), Roccella fuciformis (Angola and Madagascar), Roccella pygmaea (Algeria), and Roccella phycop Currently, Roccella montagnei (Mozambique) and Dendrographa leucophoea are the primary sources (California).
• Litmus is most commonly used to determine whether a solution is basic or acidic because, at 25 °C (77 °F), the pH range between 4.5-8.3 causes red litmus paper to turn blue and blue litmus paper to turn blue. Litmus paper that's neutral is purple.
• Water-soluble gases that change acidity or basicity can also be tested using wet litmus paper; when the gas dissolves in water, the resulting solution colours the paper. For instance, alkaline ammonia gas causes red litmus paper to turn blue. While all pH paper functions as litmus paper, the reverse is not true.

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