Wiktionary(0.00 / 0 votes)Rate this definition: 1  litmus(Noun) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels. 2  litmus(Noun) A simple test of acidity in a liquid using litmus, usually in the form of litmus paper.
http://www.definitions.net/definition/litmus
Wiktionary(0.00 / 0 votes)Rate this definition: litmus(Noun) A dyestuff extracted from certain lichens, that changes color when exposed to pH levels greater than or less than certain critical levels. litmus(Noun) A simple test of acidity in a liquid using litmus, usually in the form of litmus paper. litmus(Noun) A simple test of any attribute; a litmus test.
http://www.definitions.net/definition/litmus
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.
https://en.wikipedia.org/wiki/Litmus
A: When blue litmus paper is dipped in an acid, it turns red; when red litmus paper is dipped in an acid, it just appears to get wet. Alkacid paper, which is a universal indicator, turns orange or red when it is reacting to an acid, with a redder color indicating a lower pH and a stronger level of acidity.
https://www.reference.com/science/color-litmus-paper-turn-acid-901951023b90c888
Litmus paper 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.
https://en.wikipedia.org/wiki/Litmus
Litmus(noun) a dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.
http://www.definitions.net/definition/litmus
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.
https://en.wikipedia.org/wiki/Litmus
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,[2] because of presence of hypochlorite ions.
https://en.wikipedia.org/wiki/Litmus
Litmus - See also. 1  Nitrazine strips: measures pH about 4.5 to 7.5 with more precision. 2  Phenolphthalein. 3  Bromothymol blue. 4  Methyl orange. 5  Universal indicator: modern paper measures pH 1 to 14 with distinct colors for each. The color chart is usually included with the strips.
https://en.wikipedia.org/wiki/Litmus
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.
https://en.wikipedia.org/wiki/Litmus
what does litmus
The main use of litmus is to test whether a solution is acidic or basic.