Litmus - wikipedia Litmus For other uses, see Litmus ( disambiguation ). Look up litmus in Wiktionary, the free dictionary. Litmus powder Chemical structure of 7 - hydroxyphenoxazone, the chromophore of litmus components Litmus is a water - soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. Contents 1 History 2 Natural sources 3 Uses 4 Chemistry 5 Mechanism 6 References History Litmus was used for the first time about 1300 AD by Spanish physician Arnaldus de Villa Nova. From the 16th century on, the blue dye was extracted from some lichens, especially in the Netherlands. Natural sources Parmelia sulcata Litmus can be found in different species of lichens. The dyes are extracted from such species as Roccella tinctoria ( South America ), Roccella fuciformis ( Angola and Madagascar ), Roccella pygmaea ( Algeria ), Roccella phycopsis, Lecanora tartarea ( Norway, Sweden ), Variolaria dealbata, Ochrolechia parella, Parmotrema tinctorum, and Parmelia. Currently, the main sources are Roccella montagnei ( Mozambique ) and Dendrographa leucophoea ( California ). Uses `` Litmus test '' redirects here. For other uses, see Litmus test ( disambiguation ). Litmus paper after being used The main use of litmus is to test whether a solution is acidic or basic. Wet litmus paper can also be used to test for water - soluble gases that affect acidity or alkalinity ; the gas dissolves in the water and the resulting solution colors the litmus paper. For instance, ammonia gas, which is alkaline, turn the red litmus paper blue. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5 -- 8.3 at 25 ° C ( 77 ° F ). Neutral litmus paper is purple. Litmus can also be prepared as an aqueous solution that functions similarly. Under acidic conditions, the solution is red, and under basic conditions, the solution is blue. Litmus ( pH indicator ) below pH 4.5 above pH 8.3 4.5 ⇌ 8.3 Chemical reactions other than acid - base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white -- the litmus dye is bleached, because of presence of hypochlorite ions. This reaction is irreversible, so the litmus is not acting as an indicator in this situation. Chemistry The litmus mixture has the CAS number 1393 - 92 - 6 and contains 10 to 15 different dyes. All of the chemical components of litmus are likely to be the same as those of the related mixture known as orcein, but in different proportions. In contrast with orcein, the principal constituent of litmus has an average molecular mass of 3300. Acid - base indicators on litmus owe their properties to a 7 - hydroxyphenoxazone chromophore. Some fractions of litmus were given specific names including erythrolitmin ( or erythrolein ), azolitmin, spaniolitmin, leucoorcein, and leucazolitmin. Azolitmin shows nearly the same effect as litmus. Mechanism Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugate base, formed from the litmus acid, has a blue color, so the wet red litmus paper turns blue in alkaline solution. References ^ Jump up to : Manfred Neupert : Lackmus in Römpp Lexikon Chemie ( German ), January 31, 2013. Jump up ^ UCC - Chlorine Jump up ^ Beecken, H. ; E-M. Gottschalk ; U. v Gizycki ; H. Krämer ; D. Maassen ; H-G. Matthies ; H. Musso ; C. Rathjen ; Ul. Zdhorszky ( 2003 ). `` Orcein and Litmus ''. Biotechnic & Histochemistry. 78 ( 6 ) : 289 -- 302. doi : 10.1080 / 10520290410001671362. Jump up ^ H. Musso, C. Rathjen ( 1959 ). `` Orcein dyes. X. Light absorption and chromophore of litmus ''. Chem. Ber. 92 ( 3 ) : 751 -- 3. doi : 10.1002 / cber. 19590920331. Jump up ^ E.T. Wolf : Vollständige Übersicht der Elementar - analytischen Untersuchungen organischer Substanzen, S. 450 - 453, veröffentlicht 1846, Verlag E. Anton ( Germany ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=Litmus&oldid=842475870 '' Categories : PH indicators Paper products Talk Contents About Wikipedia Български Català Čeština Dansk Deutsch Eesti Ελληνικά Español Esperanto Euskara فارسی Français Gaeilge ગુજરાતી 한국어 Հայերեն हिन्दी Ido Bahasa Indonesia Íslenska Italiano עברית ಕನ್ನಡ ქართული Қазақша Кыргызча Magyar മലയാളം Nederlands 日本 語 Norsk Oʻzbekcha / ўзбекча Polski Português Română Русский Scots Simple English Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska தமிழ் తెలుగు ไทย Türkçe Українська Tiếng Việt 中文 43 more Edit links This page was last edited on 22 May 2018, at 18 : 10. About Wikipedia

Question: blue litmus paper turns red when the ph of a solution is
Answer: acidic